======================== unified (from filesystem) ========================
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                                        'duration'  '222'
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                                      'lastfmtags'  ("['psychedelic rock', 'rock', 'progressive rock', 'psychedelic', 'classic "
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                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '5'
                                      'tracktotal'  '13'
                                            'date'  '2016'
                                        'comments'  ''
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                                             'key'  '4A'
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rest: ''

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

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'TCON' (Content type, a.k.a. Genre)                 'rock-cppex-progressive'
'TDOR' (Original release time)                      '2001'
'TDRC' (Recording time)                             '2016-06-16'
'TIT2' (Title/songname/content description)         'When the Tigers Broke Free'
'TKEY' (Initial key)                                '4A'
'TMED' (Media type)                                 'CD'
'TPE1' (Lead performer(s)/Soloist(s))               'Pink Floyd'
'TPE2' (Band/orchestra/accompaniment)               'Pink Floyd'
'TPOS' (Part of a set)                              '2/2'
'TPUB' (Publisher)                                  'Pink Floyd Records'
'TRCK' (Track number/Position in set)               '5/13'
'TSO2'                                              'Pink Floyd'
'TSOP' (Performer sort order)                       'Pink Floyd'
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'TXXX:Artists'                                      'Pink Floyd'
'TXXX:BARCODE'                                      '888751710320'
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'TXXX:MusicBrainz Album Id'                         'aa2f022b-a94c-46d6-969b-5402346b8881'
'TXXX:MusicBrainz Album Release Country'            'US'
'TXXX:MusicBrainz Album Status'                     'official'
'TXXX:MusicBrainz Album Type'                       'album/compilation'
'TXXX:MusicBrainz Artist Id'                        '83d91898-7763-47d7-b03b-b92132375c47'
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'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:SCRIPT'                                       'Latn'
'TXXX:lastfmtags'                                   ['psychedelic rock', 'rock', 'progressive rock', 'psychedelic', 'classic rock']
'TXXX:originalyear'                                 '2001'
'TXXX:q-bass'                                       '2'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '4'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+0.93 dB'
'TXXX:replaygain_track_peak'                        '0.505182'
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========================== row from database ==========================
                                              'id'  1409731
                                            'path'  /data/Music/Bulk/00popandrock-classicprogpsy/Pink Floyd/Pink Floyd - When the Tigers Broke Free.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  222
                                           'genre'  rock-cppex-progressive
                                        'filesize'  5415268
                                           'mtime'  1620737725
                                   'redo_metaread'  0
                                        'rest_str'   00popandrock classicprogpsy rock cppex progressive
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                                     'tag_release'  Echoes: The Best of Pink Floyd
                                       'tag_title'  When the Tigers Broke Free
                                             'bpm'  143.0
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                                   'search_artist'  'floyd':2 'pink':1
                                  'search_release'  'best':4 'echoes':1,2 'floyd':7 'of':5 'pink':6 'the':3
                                     'search_rest'  'classicprogpsy':1 'cppex':3 'progressive':4 'rock':2
                                    'search_combo'  'best':11C 'broke':4A 'classicprogpsy':15 'cppex':17 'echoes':8C,9C 'floyd':7B,14C 'free':5A 'of':12C 'pink':6B,13C 'progressive':18 'rock':16 'the':2A,10C 'tigers':3A 'when':1A
                                    'tag_tracknum'  5
                                      'num_images'  1
                                             'key'  4A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-4', 'q-syn-2', 'q-chart-3', 'q-other-2', 'Q-HAP-3', 'q-bass-2', 'q-grit-2']
                                      'lastfmtags'  ['psychedelic rock', 'rock', 'progressive rock', 'psychedelic', 'classic rock']
                                        'tag_date'  2016
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620737724.6569493  (2021-05-11 14:55:24)
                             'size'  5415268