======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '387'
                                          'artist'  'Borodin Quartet'
                                     'text_people'  ''
                                         'release'  'Shostakovich: Complete String Quartets [Disc 2]'
                                           'title'  'Shostakovich: String Quartet #3 In F, Op. 73 - 4. Adagio'
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                                      'lastfmtags'  "['classical', 'string quartet', 'russian', 'borodin', 'fjh string quartets']"
                                     'discogstags'  "['classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '4'
                                      'tracktotal'  '12'
                                            'date'  '1983'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '138.607'
                                             'key'  '12A'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'COMM::eng'                                         'Cleaned by TuneUp!'
'COMM:ID3v1 Comment:XXX'                            'Cleaned by TuneUp!'
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'TALB' (Album/Movie/Show title)                     'Shostakovich: Complete String Quartets [Disc 2]'
'TBPM' (BPM (beats per minute))                     '138.607'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '1983'
'TIT2' (Title/songname/content description)         'Shostakovich: String Quartet #3 In F, Op. 73 - 4. Adagio'
'TKEY' (Initial key)                                '12A'
'TPE1' (Lead performer(s)/Soloist(s))               'Borodin Quartet'
'TPE2' (Band/orchestra/accompaniment)               'Borodin Quartet'
'TPOS' (Part of a set)                              '2/6'
'TRCK' (Track number/Position in set)               '4/12'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  'classical'
'TXXX:lastfmtags'                                   ['classical', 'string quartet', 'russian', 'borodin', 'fjh string quartets']
'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'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+2.28 dB'
'TXXX:replaygain_track_peak'                        '0.562795'

========================== row from database ==========================
                                              'id'  1337323
                                            'path'  /data/Music/Bulk/00poprockelectronic/Unsorted/[loose files]/04string quartet no 3 (adagio).mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  387
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  9320000
                                           'mtime'  1637329818
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic Unsorted [loose files] 04string quartet no (adagio) prerock classical classical instruments
                                      'tag_artist'  Borodin Quartet
                                     'tag_release'  Shostakovich: Complete String Quartets [Disc 2]
                                       'tag_title'  Shostakovich: String Quartet #3 In F, Op. 73 - 4. Adagio
                                             'bpm'  138.607
                                    'search_title'  '3':5,6 '4':13,14 '73':12 'adagio':15 'f':8,9 'in':7 'op':10,11 'quartet':4 'shostakovich':1,2 'string':3
                                   'search_artist'  'borodin':1 'quartet':2
                                  'search_release'  '2':8,9 'complete':3 'disc':6,7 'quartets':5 'shostakovich':1,2 'string':4
                                     'search_rest'  '00poprockelectronic':1 '04string':7 'adagio':10,11 'classical':13 'files':5,6 'instruments':14 'loose':3,4 'no':9 'prerock':12 'quartet':8 'unsorted':2
                                    'search_combo'  '00poprockelectronic':27 '04string':33 '2':25C,26C '3':5A,6A '4':13A,14A '73':12A 'adagio':15A,36,37 'borodin':16B 'classical':39 'complete':20C 'disc':23C,24C 'f':8A,9A 'files':31,32 'in':7A 'instruments':40 'loose':29,30 'no':35 'op':10A,11A 'prerock':38 'quartet':4A,17B,34 'quartets':22C 'shostakovich':1A,2A,18C,19C 'string':3A,21C 'unsorted':28
                                    'tag_tracknum'  4
                                      'num_images'  1
                                             'key'  12A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-2', 'q-chart-2', 'q-other-4', 'Q-HAP-2', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['classical', 'string quartet', 'russian', 'borodin', 'fjh string quartets']
                                        'tag_date'  1983
                                     'discogstags'  ['classical']

============================== file details ==============================
                                           'mtime'  1637329817.9083774  (2021-11-19 14:50:17)
                             'size'  9320000