======================== unified (from filesystem) ========================
                                         'bitrate'  '256.0'
                                        'duration'  '408'
                                          'artist'  'John Lee Hooker'
                                     'text_people'  ''
                                         'release'  'The Complete Chess Folk Blues Sessions'
                                           'title'  "Let's Go Out Tonight"
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 "'q-chart-3', 'q-drums-3', 'q-other-3', 'q-piano-1', 'q-vocals-3', "
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                                      'lastfmtags'  "['guitar', 'blues', 'jazz', 'delta blues', 'classic blues']"
                                     'discogstags'  "['blues', 'electric blues', 'chicago blues']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '2'
                                      'tracktotal'  '18'
                                            'date'  '1991'
                                        'comments'  ''
                                           'genre'  'prerock-jb-blues'
                                             'bpm'  '87.1'
                                             'key'  '6A'
                                        'acoustid'  '00532357-0340-46ed-bf2b-edd2b84f2dae'
rest: ''

======================== rawer (from filesystem) ========================

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'TBPM' (BPM (beats per minute))                     '87.1'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-blues'
'TDOR' (Original release time)                      '1991'
'TDRC' (Recording time)                             '1991'
'TIT2' (Title/songname/content description)         "Let's Go Out Tonight"
'TKEY' (Initial key)                                '6A'
'TMED' (Media type)                                 'CD'
'TPE1' (Lead performer(s)/Soloist(s))               'John Lee Hooker'
'TPE2' (Band/orchestra/accompaniment)               'John Lee Hooker'
'TPOS' (Part of a set)                              '1/1'
'TPUB' (Publisher)                                  'MCA Records'
'TRCK' (Track number/Position in set)               '2/18'
'TSO2'                                              'Hooker, John Lee'
'TSOP' (Performer sort order)                       'Hooker, John Lee'
'TXXX:Acoustid Id'                                  '00532357-0340-46ed-bf2b-edd2b84f2dae'
'TXXX:BARCODE'                                      '008811833527'
'TXXX:CATALOGNUMBER'                                'MCD 18335'
'TXXX:MusicBrainz Album Artist Id'                  'b0122194-c49a-46a1-ade7-84d1d76bd8e9'
'TXXX:MusicBrainz Album Id'                         'a8bdf460-28f8-4f1a-a680-afcfadb5e24f'
'TXXX:MusicBrainz Album Status'                     'official'
'TXXX:MusicBrainz Album Type'                       'compilation'
'TXXX:MusicBrainz Artist Id'                        'b0122194-c49a-46a1-ade7-84d1d76bd8e9'
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'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '3'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:SCRIPT'                                       'Latn'
'TXXX:discogstags'                                  ['blues', 'electric blues', 'chicago blues']
'TXXX:lastfmtags'                                   ['guitar', 'blues', 'jazz', 'delta blues', 'classic blues']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+1.64 dB'
'TXXX:replaygain_track_peak'                        '0.574057'
'UFID:http://musicbrainz.org'                       UFID(owner='http://musicbrainz.org', data=b'9aac619f-3d4a-4623-9429-2fe4437c8351')

========================== row from database ==========================
                                              'id'  1512932
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/John Lee Hooker - Chess For Blues/Let_s go out tonight.mp3
                                         'working'  None
                                         'bitrate'  256
                                    'duration_sec'  408
                                           'genre'  prerock-jb-blues
                                        'filesize'  13083737
                                           'mtime'  1620402330
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country For Let_s go out tonight prerock jb blues
                                      'tag_artist'  John Lee Hooker
                                     'tag_release'  The Complete Chess Folk Blues Sessions
                                       'tag_title'  Let's Go Out Tonight
                                             'bpm'  87.1
                                    'search_title'  'go':4 'let':1 'lets':3 'out':5 's':2 'tonight':6
                                   'search_artist'  'hooker':3 'john':1 'lee':2
                                  'search_release'  'blues':5 'chess':3 'complete':2 'folk':4 'sessions':6 'the':1
                                     'search_rest'  'blues':13 'country':4 'exotica':2 'for':5 'go':8 'jazz':1 'jb':12 'let':6 'oldies':3 'out':9 'prerock':11 's':7 'tonight':10
                                    'search_combo'  'blues':14C,28 'chess':12C 'complete':11C 'country':19 'exotica':17 'folk':13C 'for':20 'go':4A,23 'hooker':9B 'jazz':16 'jb':27 'john':7B 'lee':8B 'let':1A,21 'lets':3A 'oldies':18 'out':5A,24 'prerock':26 's':2A,22 'sessions':15C 'the':10C 'tonight':6A,25
                                    'tag_tracknum'  2
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-3', 'q-busy-2', 'q-drums-3', 'q-syn-1', 'q-chart-3', 'q-other-3', 'Q-HAP-2', 'q-bass-3', 'q-grit-2']
                                      'lastfmtags'  ['guitar', 'blues', 'jazz', 'delta blues', 'classic blues']
                                        'tag_date'  1991
                                     'discogstags'  ['blues', 'electric blues', 'chicago blues']

============================== file details ==============================
                                           'mtime'  1620402330.2512887  (2021-05-07 17:45:30)
                             'size'  13083737