======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '217'
                                          'artist'  'Etta James'
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                                           'title'  "God's Song (That's Why I Love Mankind)"
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                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '18'
                                      'tracktotal'  '22'
                                            'date'  '1993'
                                        'comments'  ''
                                           'genre'  'prerock-jb-jazz-vocal'
                                             'bpm'  '139.658'
                                             'key'  '3A'
                                        'acoustid'  '498f6305-bbf6-4065-b382-7e84a33b7555'
rest: ''

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'TBPM' (BPM (beats per minute))                     '139.658'
'TCMP'                                              '1'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-jazz-vocal'
'TCOP' (Copyright message)                          '℗ 1993 UMG Recordings, Inc.'
'TDOR' (Original release time)                      '1993'
'TDRC' (Recording time)                             '1993-06-08'
'TIT2' (Title/songname/content description)         "God's Song (That's Why I Love Mankind)"
'TKEY' (Initial key)                                '3A'
'TMED' (Media type)                                 'CD'
'TPE1' (Lead performer(s)/Soloist(s))               'Etta James'
'TPE2' (Band/orchestra/accompaniment)               'Etta James'
'TPOS' (Part of a set)                              '2/2'
'TPUB' (Publisher)                                  'MCA Records'
'TRCK' (Track number/Position in set)               '18/22'
'TSO2'                                              'James, Etta'
'TSOP' (Performer sort order)                       'James, Etta'
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'TXXX:Acoustid Id'                                  '498f6305-bbf6-4065-b382-7e84a33b7555'
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'TXXX:MusicBrainz Album Release Country'            'US'
'TXXX:MusicBrainz Album Status'                     'official'
'TXXX:MusicBrainz Album Type'                       'compilation'
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'TXXX:Q-LOCALNESS'                                  '2'
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'TXXX:Q-UNU'                                        '1'
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'TXXX:discogstags'                                  ['jazz', 'funk / soul']
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'TXXX:lastfmtags'                                   ['rhythm and blues', 'blues', 'jazz', 'female vocalists', 'soul']
'TXXX:major_brand'                                  'M4A '
'TXXX:media_type'                                   '1'
'TXXX:minor_version'                                '0'
'TXXX:purchase_date'                                '2013-09-15 21:11:56'
'TXXX:q-bass'                                       '4'
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'TXXX:q-drums'                                      '2'
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'TXXX:q-mixbeat'                                    '1'
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'TXXX:q-piano'                                      '1'
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'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:rating'                                       '0'
'TXXX:replaygain_track_gain'                        '+1.21 dB'
'TXXX:replaygain_track_peak'                        '0.489476'
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========================== row from database ==========================
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                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/Essential Etta James - CD 2/2-18 God_s Song (That_s Why I Love Mankind).mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  217
                                           'genre'  prerock-jb-jazz-vocal
                                        'filesize'  8687207
                                           'mtime'  1620528704
                                   'redo_metaread'  0
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                                      'tag_artist'  Etta James
                                     'tag_release'  The Essential Etta James
                                       'tag_title'  God's Song (That's Why I Love Mankind)
                                             'bpm'  139.658
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                                    'search_combo'  '18':25 '2':24 'cd':23 'country':22 'essential':16C 'etta':13B,17C 'exotica':20 'god':1A,26 'gods':3A 'i':9A 'james':14B,18C 'jazz':19 'jb':33 'love':10A 'mankind':11A,12A 'oldies':21 'prerock':32 's':2A,6A,27,29,31 'song':4A 'that':5A,28,30 'thats':7A 'the':15C 'vocal':34 'why':8A
                                    'tag_tracknum'  18
                                      'num_images'  0
                                             'key'  3A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-3', 'q-busy-2', 'q-drums-2', 'q-syn-1', 'q-chart-4', 'q-other-1', 'Q-HAP-3', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['rhythm and blues', 'blues', 'jazz', 'female vocalists', 'soul']
                                        'tag_date'  1993
                                     'discogstags'  ['jazz', 'funk / soul']

============================== file details ==============================
                                           'mtime'  1620528704.086249  (2021-05-09 04:51:44)
                             'size'  8687207