======================== unified (from filesystem) ========================
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                                        'duration'  '285'
                                          'artist'  'Death Angel'
                                     'text_people'  ''
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                                           'title'  '5 Steps of Freedom'
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                                      'lastfmtags'  "['thrash', 'speed metal', 'thrash metal', 'metal', 'heavy metal']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '2'
                                      'tracktotal'  '11'
                                            'date'  '2004'
                                        'comments'  ''
                                           'genre'  'eid-metal-speedmetal'
                                             'bpm'  '124.239'
                                             'key'  '10A'
                                        'acoustid'  'be093421-12fd-40c3-9df5-e927dd0052cb'
rest: ''

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

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'TCON' (Content type, a.k.a. Genre)                 'eid-metal-speedmetal'
'TDOR' (Original release time)                      '2004'
'TDRC' (Recording time)                             '2004-04-26'
'TIT2' (Title/songname/content description)         '5 Steps of Freedom'
'TKEY' (Initial key)                                '10A'
'TMED' (Media type)                                 'CD'
'TPE1' (Lead performer(s)/Soloist(s))               'Death Angel'
'TPE2' (Band/orchestra/accompaniment)               'Death Angel'
'TPOS' (Part of a set)                              '1/1'
'TPUB' (Publisher)                                  'Nuclear Blast'
'TRCK' (Track number/Position in set)               '2/11'
'TSO2'                                              'Death Angel'
'TSOP' (Performer sort order)                       'Death Angel'
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'TXXX:Acoustid Id'                                  'be093421-12fd-40c3-9df5-e927dd0052cb'
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'TXXX:MusicBrainz Album Status'                     'official'
'TXXX:MusicBrainz Album Type'                       'album'
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'TXXX:Q-UNU'                                        '2'
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'TXXX:lastfmtags'                                   ['thrash', 'speed metal', 'thrash metal', 'metal', 'heavy metal']
'TXXX:q-bass'                                       '2'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
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'TXXX:replaygain_track_gain'                        '-0.36 dB'
'TXXX:replaygain_track_peak'                        '0.327069'
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========================== row from database ==========================
                                              'id'  1325536
                                            'path'  /data/Music/Bulk/00poprockelectronic/Death Angel/The art of dying/03 - 5 steps of freedom.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  285
                                           'genre'  eid-metal-speedmetal
                                        'filesize'  6872060
                                           'mtime'  1620311687
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic art dying 03 steps freedom eid metal speedmetal
                                      'tag_artist'  Death Angel
                                     'tag_release'  The Art of Dying
                                       'tag_title'  5 Steps of Freedom
                                             'bpm'  124.239
                                    'search_title'  '5':1 'freedom':4 'of':3 'steps':2
                                   'search_artist'  'angel':2 'death':1
                                  'search_release'  'art':2 'dying':4 'of':3 'the':1
                                     'search_rest'  '00poprockelectronic':1 'art':2 'dying':3 'eid':6 'freedom':5 'metal':7 'speedmetal':8 'steps':4
                                    'search_combo'  '00poprockelectronic':11 '5':1A 'angel':6B 'art':8C,12 'death':5B 'dying':10C,13 'eid':16 'freedom':4A,15 'metal':17 'of':3A,9C 'speedmetal':18 'steps':2A,14 'the':7C
                                    'tag_tracknum'  2
                                      'num_images'  0
                                             'key'  10A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-3', 'q-syn-2', 'q-chart-2', 'q-other-4', 'Q-HAP-1', 'q-bass-2', 'q-grit-4']
                                      'lastfmtags'  ['thrash', 'speed metal', 'thrash metal', 'metal', 'heavy metal']
                                        'tag_date'  2004
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620311687.3522182  (2021-05-06 16:34:47)
                             'size'  6872060