======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '222'
                                          'artist'  'Sergei Rachmaninoff'
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                                           'title'  'Vocalise'
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                                      'lastfmtags'  "['russian', 'composers', 'piano', 'romantic', 'classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '1'
                                      'tracktotal'  '12'
                                            'date'  '1987'
                                        'comments'  ''
                                           'genre'  'electronic-experimental-early;mi-theremin'
                                             'bpm'  '95'
                                             'key'  '1A'
                                        'acoustid'  'b2b0fe3f-fcec-493f-84e3-de8e1951ec4f'
rest: ''

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

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'TBPM' (BPM (beats per minute))                     '95'
'TCON' (Content type, a.k.a. Genre)                 ['electronic-experimental-early', 'mi-theremin']
'TDOR' (Original release time)                      '1987'
'TDRC' (Recording time)                             '1987'
'TIT2' (Title/songname/content description)         'Vocalise'
'TKEY' (Initial key)                                '1A'
'TMED' (Media type)                                 'CD'
'TPE1' (Lead performer(s)/Soloist(s))               'Sergei Rachmaninoff'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TPOS' (Part of a set)                              '1/1'
'TPUB' (Publisher)                                  'Delos'
'TRCK' (Track number/Position in set)               '1/12'
'TSO2'                                              'Rockmore, Clara'
'TSOP' (Performer sort order)                       'Rachmaninoff, Sergei'
'TXXX:Acoustid Id'                                  'b2b0fe3f-fcec-493f-84e3-de8e1951ec4f'
'TXXX:Artists'                                      'Sergei Rachmaninoff'
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'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-PIANO'                                      '2'
'TXXX:Q-PLAY'                                       '2'
'TXXX:Q-UNU'                                        '2'
'TXXX:SCRIPT'                                       'Latn'
'TXXX:lastfmtags'                                   ['russian', 'composers', 'piano', 'romantic', 'classical']
'TXXX:originalyear'                                 '1987'
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '1'
'TXXX:q-syn'                                        '3'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+0.73 dB'
'TXXX:replaygain_track_peak'                        '0.449781'
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========================== row from database ==========================
                                              'id'  1363671
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wieniawski - Clara Rockmore - The Moogs Present Clara Rockmore Virtuoso Theremin pt.1/Clara Rockmore Theremin 01 Rachmaninoff Vocalise.mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  222
                                           'genre'  electronic-experimental-early;mi-theremin
                                        'filesize'  8969755
                                           'mtime'  1620528010
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                                        'rest_str'   00exnnpjpsprgttidm Wieniawski Clara Rockmore Moogs Present Clara Rockmore Virtuoso pt.1 Clara Rockmore 01 electronic experimental early;mi theremin
                                      'tag_artist'  Sergei Rachmaninoff
                                     'tag_release'  The Art of the Theremin
                                       'tag_title'  Vocalise
                                             'bpm'  95.0
                                    'search_title'  'vocalise':1
                                   'search_artist'  'rachmaninoff':2 'sergei':1
                                  'search_release'  'art':2 'of':3 'the':1 'theremin':4
                                     'search_rest'  '1':8 'clara':2 'early':12,14 'electronic':10 'experimental':11 'mi':13,15 'moogs':4 'present':5 'pt':7 'pt1':9 'rockmore':3 'theremin':16 'virtuoso':6 'wieniawski':1
                                    'search_combo'  '1':15 'art':5C 'clara':9 'early':19,21 'electronic':17 'experimental':18 'mi':20,22 'moogs':11 'of':6C 'present':12 'pt':14 'pt1':16 'rachmaninoff':3B 'rockmore':10 'sergei':2B 'the':4C 'theremin':7C,23 'virtuoso':13 'vocalise':1A 'wieniawski':8
                                    'tag_tracknum'  1
                                      'num_images'  1
                                             'key'  1A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-mixbeat-1', 'Q-PIANO-2', 'Q-OLDST-2', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-3', 'q-chart-2', 'q-other-1', 'Q-HAP-3', 'Q-PLAY-2', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['russian', 'composers', 'piano', 'romantic', 'classical']
                                        'tag_date'  1987
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620528009.5116417  (2021-05-09 04:40:09)
                             'size'  8969755