======================== unified (from filesystem) ========================
                                         'bitrate'  '256.0'
                                        'duration'  '225'
                                          'artist'  'John Lee Hooker'
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                                         'release'  'The Complete Chess Folk Blues Sessions'
                                           'title'  'House Rent Blues'
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                                      'lastfmtags'  "['guitar', 'blues', 'jazz', 'delta blues', 'classic blues']"
                                     'discogstags'  "['blues', 'electric blues', 'chicago blues']"
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                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '15'
                                      'tracktotal'  '18'
                                            'date'  '1991'
                                        'comments'  ''
                                           'genre'  'prerock-jb-blues'
                                             'bpm'  '136.6'
                                             'key'  '10A'
                                        'acoustid'  'd0d41ac2-e561-442e-8b15-34eb3259e9de'
rest: ''

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

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'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-blues'
'TDOR' (Original release time)                      '1991'
'TDRC' (Recording time)                             '1991'
'TIT2' (Title/songname/content description)         'House Rent Blues'
'TKEY' (Initial key)                                '10A'
'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)               '15/18'
'TSO2'                                              'Hooker, John Lee'
'TSOP' (Performer sort order)                       'Hooker, John Lee'
'TXXX:Acoustid Id'                                  'd0d41ac2-e561-442e-8b15-34eb3259e9de'
'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-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'                                       '4'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '1'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+2.21 dB'
'TXXX:replaygain_track_peak'                        '0.679471'
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========================== row from database ==========================
                                              'id'  1466023
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/John Lee Hooker - Chess For Blues/House rent blues.mp3
                                         'working'  None
                                         'bitrate'  256
                                    'duration_sec'  225
                                           'genre'  prerock-jb-blues
                                        'filesize'  7208898
                                           'mtime'  1620402330
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country For rent blues prerock jb blues
                                      'tag_artist'  John Lee Hooker
                                     'tag_release'  The Complete Chess Folk Blues Sessions
                                       'tag_title'  House Rent Blues
                                             'bpm'  136.6
                                    'search_title'  'blues':3 'house':1 'rent':2
                                   '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':7 'country':4 'exotica':2 'for':5 'jazz':1 'jb':9 'oldies':3 'prerock':8 'rent':6
                                    'search_combo'  'blues':3A,11C,19 'chess':9C 'complete':8C 'country':16 'exotica':14 'folk':10C 'for':17 'hooker':6B 'house':1A 'jazz':13 'jb':21 'john':4B 'lee':5B 'oldies':15 'prerock':20 'rent':2A,18 'sessions':12C 'the':7C
                                    'tag_tracknum'  15
                                      'num_images'  0
                                             'key'  10A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', '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-2', 'q-syn-1', 'q-chart-3', 'q-other-1', 'Q-HAP-2', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['guitar', 'blues', 'jazz', 'delta blues', 'classic blues']
                                        'tag_date'  1991
                                     'discogstags'  ['blues', 'electric blues', 'chicago blues']

============================== file details ==============================
                                           'mtime'  1620402330.0347784  (2021-05-07 17:45:30)
                             'size'  7208898