======================== unified (from filesystem) ========================
                                         'bitrate'  '204.033'
                                        'duration'  '192'
                                          'artist'  'Anton Rubinstein'
                                     'text_people'  ''
                                         'release'  '100 Masterpieces, Volume 7: The Top 10 of Classical Music 1854-1866'
                                           'title'  'Melody in F'
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                                      'lastfmtags'  "['classical', 'piano', 'russian', 'romantic']"
                                     'discogstags'  "['classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '2'
                                      'tracktotal'  '10'
                                            'date'  '1991'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '136.5'
                                             'key'  '10B'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'TALB' (Album/Movie/Show title)                     '100 Masterpieces, Volume 7: The Top 10 of Classical Music 1854-1866'
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'TCMP'                                              '1'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDOR' (Original release time)                      '1991'
'TDRC' (Recording time)                             '1991-03-19'
'TENC' (Encoded by)                                 'Exact Audio Copy   (Burst mode)'
'TIT2' (Title/songname/content description)         'Melody in F'
'TKEY' (Initial key)                                '10B'
'TMED' (Media type)                                 'CD'
'TPE1' (Lead performer(s)/Soloist(s))               'Anton Rubinstein'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TPOS' (Part of a set)                              '1/1'
'TPUB' (Publisher)                                  'LaserLight Digital'
'TRCK' (Track number/Position in set)               '2/10'
'TSO2'                                              'Various Artists'
'TSOP' (Performer sort order)                       'Rubinstein, Anton'
'TXXX:Artists'                                      'Anton Rubinstein'
'TXXX:BARCODE'                                      '018111568227'
'TXXX:CATALOGNUMBER'                                '15 682'
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'TXXX:MusicBrainz Album Id'                         'f03c8b31-5d9a-4493-a556-3f202a86d969'
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'TXXX:MusicBrainz Album Status'                     'official'
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'TXXX:MusicBrainz Release Track Id'                 '2eb55104-1eb4-3e91-83cf-eceb03aaff69'
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'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:SCRIPT'                                       'Latn'
'TXXX:discogstags'                                  'classical'
'TXXX:lastfmtags'                                   ['classical', 'piano', 'russian', 'romantic']
'TXXX:originalyear'                                 '1991'
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+1.99 dB'
'TXXX:replaygain_track_peak'                        '0.697116'
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========================== row from database ==========================
                                              'id'  1214422
                                            'path'  /data/Music/Bulk/00instruments-classical/The Top 100 Masterpieces of Classical Music 1685-1928/Disc 7 - 1854-1866/02 - 1858 Rubinstein- Melody in F.mp3
                                         'working'  None
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                                    'duration_sec'  192
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  5006603
                                           'mtime'  1620561810
                                   'redo_metaread'  0
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                                      'tag_artist'  Anton Rubinstein
                                     'tag_release'  100 Masterpieces, Volume 7: The Top 10 of Classical Music 1854-1866
                                       'tag_title'  Melody in F
                                             'bpm'  136.5
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                                   'search_artist'  'anton':1 'rubinstein':2
                                  'search_release'  '100':1 '1854':12 '18541866':14 '1866':13 '7':5,6 'classical':10 'masterpieces':2,3 'music':11 'of':9 'the':7 'top':8 'volume':4
                                     'search_rest'  '00instruments':1 '1685':3 '1858':6 '1928':4 'classical':2 'disc':5 'instruments':9 'or':8 'prerock':7
                                    'search_combo'  '00instruments':20 '100':6C '1685':22 '1854':17C '18541866':19C '1858':25 '1866':18C '1928':23 '7':10C,11C 'anton':4B 'classical':15C,21 'disc':24 'f':3A 'in':2A 'instruments':28 'masterpieces':7C,8C 'melody':1A 'music':16C 'of':14C 'or':27 'prerock':26 'rubinstein':5B 'the':12C 'top':13C 'volume':9C
                                    'tag_tracknum'  2
                                      'num_images'  1
                                             'key'  10B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['classical', 'piano', 'russian', 'romantic']
                                        'tag_date'  1991
                                     'discogstags'  ['classical']

============================== file details ==============================
                                           'mtime'  1620561809.7141428  (2021-05-09 14:03:29)
                             'size'  5006603