Question: Different method for release approach

[phirestalker]

I am using releases approach since you mentioned it is more accurate. I had to spin up my own musicbrainz server because HOLY CRAP is it slow. It is much faster with. my own server, but still pretty slow. At least it should finish today.

I was looking through the code and an example recording that has an associated work. I realize we must fetch the work from the work id. I noticed that each item has a 'start' and 'end' key with a date. I was wondering why the 'start' or 'end' dates are not used instead of fetching the recording for each item in 'recording-relation-list'? Are those dates not reliable?

For example:
Poker face by Lady Gaga
Recording ID: 35618652-47d7-495d-806a-ee1b88eeb776 has the associated work id: 9f6363b8-7df7-3732-b2b6-94c0f02e0bde
and when using musicbrainzngs.get_work_by_id('9f6363b8-7df7-3732-b2b6-94c0f02e0bde', ['recording-rels'])['work'], I get the following data.

{'id': '9f6363b8-7df7-3732-b2b6-94c0f02e0bde', 'type': 'Song', 'title': 'Poker Face', 'language': 'eng', 'iswc': 'T-901.751.548-9', 'iswc-list': ['T-901.751.548-9'], 'attribute-list': [{'attribute': 'BMI ID', 'value': '9990767'}, {'attribute': 'AACIMH ID', 'value': '3923568'}, {'attribute': 'ACAM ID', 'value': '3923568'}, {'attribute': 'AEI ID', 'value': '3923568'}, {'attribute': 'AGADU ID', 'value': '6145641'}, {'attribute': 'AKM ID', 'value': '576954201'}, {'attribute': 'APA ID', 'value': '5796906'}, {'attribute': 'APDAYC ID', 'value': '3125255'}, {'attribute': 'APRA ID', 'value': 'GW37090318'}, {'attribute': 'ARTISJUS ID', 'value': '4000251094'}, {'attribute': 'BUMA/STEMRA ID', 'value': 'W-005497488'}, {'attribute': 'COMPASS ID', 'value': '8988023'}, {'attribute': 'COMPASS ID', 'value': '8808605'}, {'attribute': 'COMPASS ID', 'value': '9092601'}, {'attribute': 'COMPASS ID', 'value': '9946198'}, {'attribute': 'COMPASS ID', 'value': '6513714'}, {'attribute': 'ECAD ID', 'value': '2972669'}, {'attribute': 'GEMA ID', 'value': '10515346-001'}, {'attribute': 'JASRAC ID', 'value': '0Z6-7276-1'}, {'attribute': 'NICAUTOR ID', 'value': '3923568'}, {'attribute': 'PRS tune code', 'value': '9026025T'}, {'attribute': 'SABAM ID', 'value': '182653050'}, {'attribute': 'SACEM ID', 'value': '23 759 517 11'}, {'attribute': 'SACIM ID', 'value': '3923568'}, {'attribute': 'SACM ID', 'value': '155751365'}, {'attribute': 'SACVEN ID', 'value': '3863718'}, {'attribute': 'SADAIC ID', 'value': '895238'}, {'attribute': 'SAYCE ID', 'value': '5496814'}, {'attribute': 'SAYCO ID', 'value': '5496814'}, {'attribute': 'SGACEDOM ID', 'value': '3923568'}, {'attribute': 'SGAE ID', 'value': '9.440.739'}, {'attribute': 'SIAE ID', 'value': '8852307900'}, {'attribute': 'SIAE ID', 'value': '8861599100'}, {'attribute': 'SOBODAYCOM ID', 'value': '3923568'}, {'attribute': 'SOCAN ID', 'value': '47754524'}, {'attribute': 'SOCAN ID', 'value': '41066551'}, {'attribute': 'SPA ID', 'value': '1190568'}, {'attribute': 'SPAC ID', 'value': '3923568'}, {'attribute': 'SUISA ID', 'value': '004077 606 57'}], 'recording-relation-list': [{'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': 'fc1cbf87-420b-426c-ae24-0a09f582b75f', 'ordering-key': '2', 'direction': 'backward', 'begin': '2009-06-21', 'end': '2009-06-21', 'ended': 'true', 'attribute-list': ['live', 'medley'], 'recording': {'id': 'fc1cbf87-420b-426c-ae24-0a09f582b75f', 'title': 'Love Game / Poker Face', 'length': '359320', 'disambiguation': 'live, 2009-06-21, MMVAs: 299 Queen Street West, Toronto, ON, Canada'}, 'attributes': [{'type-id': '70007db6-a8bc-46d7-a770-80e6a0bb551a', 'attribute': 'live'}, {'type-id': '37da3398-5d1b-4acb-be25-df95e33e423c', 'attribute': 'medley'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': 'ebad65c6-fda5-49dd-aad2-7b147c62392b', 'direction': 'backward', 'begin': '2009-09-28', 'end': '2009-09-28', 'ended': 'true', 'attribute-list': ['cover', 'live'], 'recording': {'id': 'ebad65c6-fda5-49dd-aad2-7b147c62392b', 'title': 'Poker Face', 'length': '188000', 'disambiguation': "live, 2009-09-28: BBC Radio 1's Live Lounge: London, UK"}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}, {'type-id': '70007db6-a8bc-46d7-a770-80e6a0bb551a', 'attribute': 'live'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '35a97504-f9b3-461c-99f3-aa2561a1e4e5', 'direction': 'backward', 'begin': '2019-05-19', 'end': '2019-05-23', 'ended': 'true', 'attribute-list': ['cover'], 'recording': {'id': '35a97504-f9b3-461c-99f3-aa2561a1e4e5', 'title': 'Poker Face', 'length': '236000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '6feec9d8-d3e0-4dba-99d6-e29256ddafa4', 'direction': 'backward', 'attribute-list': ['cover', 'live', 'medley', 'partial'], 'recording': {'id': '6feec9d8-d3e0-4dba-99d6-e29256ddafa4', 'title': 'Anniversary Medley Part 3', 'length': '389773'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}, {'type-id': '70007db6-a8bc-46d7-a770-80e6a0bb551a', 'attribute': 'live'}, {'type-id': '37da3398-5d1b-4acb-be25-df95e33e423c', 'attribute': 'medley'}, {'type-id': 'd2b63be6-91ec-426a-987a-30b47f8aae2d', 'attribute': 'partial'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '8a4e862b-06c1-450d-ae40-fde560d41d76', 'direction': 'backward', 'attribute-list': ['cover', 'live', 'medley'], 'recording': {'id': '8a4e862b-06c1-450d-ae40-fde560d41d76', 'title': 'Ein bisschen Gaga', 'length': '224613'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}, {'type-id': '70007db6-a8bc-46d7-a770-80e6a0bb551a', 'attribute': 'live'}, {'type-id': '37da3398-5d1b-4acb-be25-df95e33e423c', 'attribute': 'medley'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': 'daddb3fe-59e0-4442-ba9a-9fbbe0cf3a41', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': 'daddb3fe-59e0-4442-ba9a-9fbbe0cf3a41', 'title': 'Lady Gaga ‘Poker Face’', 'length': '232000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '6f8de9eb-a43c-4954-b092-279ac855019a', 'direction': 'backward', 'attribute-list': ['medley'], 'recording': {'id': '6f8de9eb-a43c-4954-b092-279ac855019a', 'title': 'Lady Gaga Medley', 'length': '234000'}, 'attributes': [{'type-id': '37da3398-5d1b-4acb-be25-df95e33e423c', 'attribute': 'medley'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '8c78fe62-a67c-4942-9744-a79901a4d9ec', 'direction': 'backward', 'attribute-list': ['cover', 'medley'], 'recording': {'id': '8c78fe62-a67c-4942-9744-a79901a4d9ec', 'title': 'Lady Gaga Medley', 'length': '175000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}, {'type-id': '37da3398-5d1b-4acb-be25-df95e33e423c', 'attribute': 'medley'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '31730583-2acb-4499-a44c-aff134c4ffab', 'direction': 'backward', 'attribute-list': ['live', 'medley'], 'recording': {'id': '31730583-2acb-4499-a44c-aff134c4ffab', 'title': 'Medley "Étrange avion" : Poker Face / L’eté s’ra chaud / Y’a le printemps qui chante (Viens à la maison) / Rolling in the Deep / French Cancan / Party Rock Anthem', 'length': '928813', 'disambiguation': 'live, 2012-02: Halle Tony-Garnier, Lyon, France'}, 'attributes': [{'type-id': '70007db6-a8bc-46d7-a770-80e6a0bb551a', 'attribute': 'live'}, {'type-id': '37da3398-5d1b-4acb-be25-df95e33e423c', 'attribute': 'medley'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '650de76f-982d-4082-ad39-ce2fe0dc3690', 'direction': 'backward', 'attribute-list': ['cover', 'live', 'medley'], 'recording': {'id': '650de76f-982d-4082-ad39-ce2fe0dc3690', 'title': 'Medley: Poker Face / Paparazzi / Just Dance', 'length': '159000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}, {'type-id': '70007db6-a8bc-46d7-a770-80e6a0bb551a', 'attribute': 'live'}, {'type-id': '37da3398-5d1b-4acb-be25-df95e33e423c', 'attribute': 'medley'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '70c25444-ca06-4b4a-8104-18a21c910d96', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': '70c25444-ca06-4b4a-8104-18a21c910d96', 'title': 'Poker Face', 'length': '195506'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': 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'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '0f958372-8cfb-454e-9692-bbd28434917a', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': '0f958372-8cfb-454e-9692-bbd28434917a', 'title': 'Poker Face', 'length': '219613'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '6b8e790e-cc12-4e48-bd42-4f82ffb74345', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': '6b8e790e-cc12-4e48-bd42-4f82ffb74345', 'title': 'Poker Face', 'length': '266000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '3dd2b0dd-540c-4e21-8f02-b3f0d45db9e7', 'direction': 'backward', 'attribute-list': ['cover', 'live'], 'recording': {'id': '3dd2b0dd-540c-4e21-8f02-b3f0d45db9e7', 'title': 'Poker Face', 'length': '186000', 'disambiguation': 'Live Lounge version'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}, {'type-id': '70007db6-a8bc-46d7-a770-80e6a0bb551a', 'attribute': 'live'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': 'd63ac673-d1f4-43c9-9a26-bbc1a2d493e4', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': 'd63ac673-d1f4-43c9-9a26-bbc1a2d493e4', 'title': 'Poker Face', 'length': '148000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': 'f7677742-c278-4285-b20e-d91e6d70bc52', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': 'f7677742-c278-4285-b20e-d91e6d70bc52', 'title': 'Poker Face', 'length': '195000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 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'109413'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': 'fc5774b2-e5e4-44a3-8b43-26f5baadae4d', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': 'fc5774b2-e5e4-44a3-8b43-26f5baadae4d', 'title': 'Poker Face', 'length': '194120'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': 'a6a82356-272c-4114-bd6d-b407002ff069', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': 'a6a82356-272c-4114-bd6d-b407002ff069', 'title': 'Poker Face', 'length': '195000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '0e5a2b99-a21f-4ad5-b3c0-bd086b5b543e', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': '0e5a2b99-a21f-4ad5-b3c0-bd086b5b543e', 'title': 'Poker Face', 'length': '206000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': 'd61f4526-f302-450a-b669-d014198294a5', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': 'd61f4526-f302-450a-b669-d014198294a5', 'title': 'Poker Face', 'length': '210000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '5556f48a-4c6b-4dbf-829a-961474b04079', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': '5556f48a-4c6b-4dbf-829a-961474b04079', 'title': 'Poker Face', 'length': '190000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '9f00b471-a2bb-4b74-8aa4-6b37e7e3b903', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': '9f00b471-a2bb-4b74-8aa4-6b37e7e3b903', 'title': 'Poker Face', 'length': '236000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '1e7b7ed7-b421-4d62-8d89-b9134cb3f2c1', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': '1e7b7ed7-b421-4d62-8d89-b9134cb3f2c1', 'title': 'Poker Face', 'length': '195000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '82a74df5-4012-49b6-a5ae-3fc6a83e5cfc', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': '82a74df5-4012-49b6-a5ae-3fc6a83e5cfc', 'title': 'Poker 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Edit)', 'length': '184000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': 'c1ceddcf-3674-4368-b79e-c3490fd61730', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': 'c1ceddcf-3674-4368-b79e-c3490fd61730', 'title': 'Poker Face (Kindervater Remix)', 'length': '284000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '8ab44e25-7b0e-4543-b8ea-e4e5c0574f17', 'direction': 'backward', 'attribute-list': ['live'], 'recording': {'id': '8ab44e25-7b0e-4543-b8ea-e4e5c0574f17', 'title': 'Poker Face (live at The Cherrytree House piano & voice version)', 'length': '218960'}, 'attributes': [{'type-id': '70007db6-a8bc-46d7-a770-80e6a0bb551a', 'attribute': 'live'}]}, {'type': 'performance', 'type-id': 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'b7c01133-b99b-4255-a6cd-0fbadeffe5ee', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': 'b7c01133-b99b-4255-a6cd-0fbadeffe5ee', 'title': 'Poker Face (radio edit)', 'length': '196000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': 'cf225771-df74-4ad0-bb7e-73735dc5b21d', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': 'cf225771-df74-4ad0-bb7e-73735dc5b21d', 'title': 'Poker Face (radio edit)', 'length': '193000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': 'd6378491-e2e0-4acd-acf0-91c0ba9139fd', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': 'd6378491-e2e0-4acd-acf0-91c0ba9139fd', 'title': 'Poker Face (Radio Edit)', 'length': '194000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '34ed65be-26ca-417d-8e57-b2096ff4d57f', 'direction': 'backward', 'recording': {'id': '34ed65be-26ca-417d-8e57-b2096ff4d57f', 'title': 'Poker Face (Space Cowboy remix)', 'length': '294906'}}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '5d1c50b1-507b-498d-b309-e8e5a9d086fe', 'direction': 'backward', 'recording': {'id': '5d1c50b1-507b-498d-b309-e8e5a9d086fe', 'title': 'Poker Face (Space Cowboys mix)', 'length': '141493'}}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': 'e2ba87cd-82b2-4975-a12a-8fd54b6a1288', 'direction': 'backward', 'recording': {'id': 'e2ba87cd-82b2-4975-a12a-8fd54b6a1288', 'title': 'Poker Face (Tommy Sparks & The Fury remix)', 'length': '238613'}}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': 'cc9b2db7-2c32-4777-ba24-69f91569d12a', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': 'cc9b2db7-2c32-4777-ba24-69f91569d12a', 'title': 'Poker Face (Walker & Daniels Remix Edit)', 'length': '210000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': 'ddb00cfc-c16d-4546-bcdc-e4b03a805ef6', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': 'ddb00cfc-c16d-4546-bcdc-e4b03a805ef6', 'title': 'Poker Face (Walker & Daniels remix)', 'length': '325000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': 'b850a2f3-07e6-4004-85ec-ee8093b531c8', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': 'b850a2f3-07e6-4004-85ec-ee8093b531c8', 'title': 'Poker Face (Walker & Daniels remix)', 'length': '225586', 'disambiguation': 'part of “Tunnel Trance Force, Volume 49” DJ-mix'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': 'f5d2c3fa-39ea-4926-a828-2197fa6e393f', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': 'f5d2c3fa-39ea-4926-a828-2197fa6e393f', 'title': 'Poker Face (Walker & Daniels Remix)', 'length': '323000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': 'b8692f53-fa70-4a5d-9faa-326f217da0d5', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': 'b8692f53-fa70-4a5d-9faa-326f217da0d5', 'title': 'Poker Face [Lady Gaga]', 'length': '192000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '9dba5dac-84da-4165-9532-fd5ad0cdf996', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': '9dba5dac-84da-4165-9532-fd5ad0cdf996', 'title': 'Pokerface', 'length': '191000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '0a174127-a27f-4372-b13c-dc24943a90a0', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': '0a174127-a27f-4372-b13c-dc24943a90a0', 'title': 'Pokerface', 'length': '255000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '56ca63eb-bc85-494b-88e2-cc8a2b505387', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': '56ca63eb-bc85-494b-88e2-cc8a2b505387', 'title': 'Pokerface', 'length': '172000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': 'bcc498b1-dacd-4444-89e5-c706165d8e1f', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': 'bcc498b1-dacd-4444-89e5-c706165d8e1f', 'title': 'Pokerface', 'length': '225000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': 'da23efb2-6142-4467-a301-a6203b552866', 'direction': 'backward', 'recording': {'id': 'da23efb2-6142-4467-a301-a6203b552866', 'title': 'Pokerface (DJ Gigi Smart Special av8 blend)', 'length': '205000'}}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '2faf243f-ef0f-4a25-9bb7-c539121eaa7c', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': '2faf243f-ef0f-4a25-9bb7-c539121eaa7c', 'title': 'Polka Face', 'length': '258000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': '5de41ce3-a3bc-43ab-8827-3ef146141b79', 'direction': 'backward', 'attribute-list': ['cover'], 'recording': {'id': '5de41ce3-a3bc-43ab-8827-3ef146141b79', 'title': "Somebody's Watching My Poker Face", 'length': '257000'}, 'attributes': [{'type-id': '1e8536bd-6eda-3822-8e78-1c0f4d3d2113', 'attribute': 'cover'}]}, {'type': 'performance', 'type-id': 'a3005666-a872-32c3-ad06-98af558e99b0', 'target': 'c13fbfad-76ec-4362-b2f7-948ba3f04901', 'direction': 'backward', 'recording': {'id': 'c13fbfad-76ec-4362-b2f7-948ba3f04901', 'title': 'Stand Up To My Pokerface (Blend Brothers mix)', 'length': '379000'}}]}

If I am understanding the structure correctly, you could filter out the covers or whatever, and then each one has the 'start', 'end' and under 'recording' is the title, which you could match with the current title to make sure it is the same.

I would like to know your thoughts on this approach. Did you consider it, and it did not give accurate results? Or might it speed things up by using less requests to MB?

Great plugin by the way.

[phirestalker]

I spent a little more time looking through that mass of data and found a lot of the items were missing the 'begin' and 'end' keys. Also, some of the dates are way off. I saw a 1925 in there for the 'begin' and 'end' on one of the recordings. Seems your method is by far the best. I just wish that it allowed you fetch the whole recording for each of the items in the recording-relation-list when you grab the work. Oh well. Thanks again.

[kernitus]

Yes, unfortunately there is a lot of incomplete data and fetching all of the releases is the only way to guarantee good accuracy. The problem is that each one is a separate request, which makes it very slow. If Musicbrainz implemented something like GraphQL, the amount of requests could be reduced significantly, but for now a good workaround is to run your own mirror.

[kernitus]

@phirestalker I have made a fair few changes to close all open issues. If you'd like to test them, you can let me know if the plugin still works as intended and the changes too.

Regarding this issue, I thought of a different, more heuristic approach. It is theoretically possible to perform a search for releases, with a specific artist ID and the title of the track. Such a search can return up to 100 matches, including the date fields for the release. This can be used to get this information in one request, see example below.

https://musicbrainz.org/ws/2/release/?query=arid:83d91898-7763-47d7-b03b-b92132375c47%20AND%20release:%22wish%20you%20were%20here%22&limit=100&fmt=json

However, it's possible for the search to return unrelated items, which would somehow have to be detected and removed. It also remains to see if the artist id on various releases is correctly set, for it might work properly for well-known artists, but might not be accurate enough for more obscure ones. Still, it seems worth investigating.

[phirestalker]

That sounds interesting, and it should be relatively trivial to filter the unrelated ones. Another interesting thing I found while rebuilding my local musicbrainz server

Building release_first_release_date

To me, that sounds like a material table that has the exact data we want. I wonder if they make it available to the API easily somehow?

EDIT:
Oh, and they also have a recording_first_release_date table. These tables are built with SQL commands and are denormalized to speed up certain searches. Imagine if we could just run SQL commands, that would take just one query I bet. Anyway, some interesting things to consider indeed.

[kernitus]

The problem with filtering the search is with slightly different versions of the same song. For example, the matched recording you picked has Remix/Edit/Remaster in the title, and thus the original version will not show up in the search, although these words could be easily filtered out.

A different problem occurs when the title is slightly different because it's two songs in one, or it includes ft. Artist. This can also be filtered out, although less easily. The search feature supports Lucene queries meaning fuzzy / regex / proximity searches are supported.

Regarding the release_first_release_date and recording_first_release_date fields, these seem to be accessible through the search api, e.g. firstreleasedate on Recording, and Release Group. However, I don't know if this field is maintained by the database or user-edited, and whether it actually corresponds to the oldest possible date or not.

For example, you perform a search for recordings with a specific artist ID that match a specific release/recording title, and look for the first-release-date field for each and find the oldest:

import requests
from datetime import datetime
from urllib.parse import quote_plus

artist_id = "83d91898-7763-47d7-b03b-b92132375c47"
release_title = "wish you were here"

url = f"https://musicbrainz.org/ws/2/recording/?query=arid:{quote_plus(artist_id)}%20AND%20recording:%22{quote_plus(release_title)}%22&limit=100&fmt=json"

response = requests.get(url)
data = response.json()

oldest_date = datetime.max

for recording in data['recordings']:
    # Check if 'first-release-date' is in the recording data
    if 'first-release-date' in recording:
        for format in ["%Y-%m-%d", "%Y-%m", "%Y"]:
            try:
                release_date = datetime.strptime(recording['first-release-date'], format)
                if release_date < oldest_date:
                    oldest_date = release_date
                break
            except ValueError:
                pass

print(f"The oldest release date is: {oldest_date.strftime('%Y-%m-%d')}")

The oldest release date is: 1981-11-23

[phirestalker]

It may take me a couple of days, but I will incorporate this into a function and run it alongside your releases method. Then compare the date returned for the oldest date. I will try to get some metrics on when they match and print a list of the ones that don't match so we can analyze those cases. I may attempt to contact metabrainz and ask them how this table is generated, with user entries or from data already in the database using a query similar to how you do it now.

I guess I will need to save some data for the ones that don't match so we know if it is using the wrong recordings like you mentioned.

[phirestalker]

Quick question. Your code uses a search function to get the first-release-date field. Does that mean it is not returned when using get_recording_by_id in musicbrainzngs? If so I wonder if that is a failing of the library or if musicbrainz does not offer it through those queries.

[kernitus]

I now notice that first-release-date seems to be included when fetching a recording - at least directly through the API:

https://musicbrainz.org/ws/2/recording/8f3471b5-7e6a-48da-86a9-c1c07a0f47ae?fmt=json

However, this doesn't solve the fundamental problem of needing to fetch every single recording (or enough of them) to get the real original date for a song.

Besides, it isn't included with all recordings, because sometimes the releases do not have a date associated with them:

https://musicbrainz.org/ws/2/recording/aae44009-6745-40ae-a477-f215c4f76488?fmt=json

It appears musicbrainzngs does not return this field:

https://github.com/alastair/python-musicbrainzngs/blob/1638c6271e0beb9560243c2123d354461ec9f842/musicbrainzngs/musicbrainz.py#L137

[phirestalker]

I guess we can't use that until musicbrainzngs adds it. I noticed that recordings that have first-release-date have no other date field. I wonder if they are working to clean up the data so that the album has a release date and each track has a first-release-date linked to a work? That would be fantastic.

I think if musicbrainzngs returned it, it might be ok (once we determine its accuracy) to use first-release-date if it exists, and switch to using the user set approach after that, or make it another ooption to approach.

To make theses tests I am creating a new OldestDatePlugin object and setting config options directly. How would I be able o set the mb host and rate limit since those are set at the beets level?

EDIT:
Nevermind, I figured out how to set the mb host and ratelimit.

[phirestalker]

Man, I started this test on Thursday and it is still running. Because of the way os.walk() works I can't use a progress bar wrapped around it, so I have no idea how long it has taken or how long it has left to run. No big, but I wanted to keep you updated.

[kernitus]

Man, I started this test on Thursday and it is still running. Because of the way os.walk() works I can't use a progress bar wrapped around it, so I have no idea how long it has taken or how long it has left to run. No big, but I wanted to keep you updated.

Which fields are you planning on comparing? The first-release-date on a given recording? Or a search?

[phirestalker]

I am fetching a certain recording and its first-recording-date. I then use the same MB id to feed to your plugin with the releases approach and save the date it gives. I will show the amonut of recordings missing a first-recording-date, the number of those that found a date with your method. I will also show when the dates differ between methods and which one is older. I'm not sure how much deeper I can go since your function only returns the date and not the recording or release it go tthe date from.

Let me know what other metrics or data you would like.
Come to think of it, I wonder if I should get the genres of the music to see if there is more coverage for certain ones.

[phirestalker]

Finally!
Here we go.
It looks like there are only 14 recordings missing first-recording-date out of 9312. However, there are 1554 out of 9312 songs where your method has an older date than first-recording-date. Some of these are arbitrary like day 01 instead of 02, but there seems to be enough egregious ones to make it not usable.

Well, that was fun. Let me know if you want me to test the idea you had before I saw first-recording-date.