======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '35'
                                          'artist'  'Gary Graffman'
                                     'text_people'  'Brahms, Johannes'
                                         'release'  'Nodame Cantabile Best100'
                                           'title'  'Variation on a theme by Paganini, Op.35 - Book II, Variation 2'
                                           'quals'  ("['Q-HAP-2', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'Q-PLAY-3', 'q-bass-1', 'q-busy-3', 'q-grit-1', "
 "'Q-PIANO-4', 'q-chart-3', 'q-drums-1', 'q-other-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['american', 'piano', 'composer', 'classical', 'classic']"
                                     'discogstags'  "['classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '18'
                                      'tracktotal'  '36'
                                            'date'  '1967'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '142.9'
                                             'key'  '8B'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'COMM:iTunNORM:eng'                                 (' 00000091 00000094 00001359 00000716 000032EB 00003578 00003599 00002D3F '
 '000032D0 00000E49')
'COMM:iTunPGAP:eng'                                 '0'
'COMM:iTunSMPB:eng'                                 (' 00000000 00000210 000006F0 0000000000181E00 00000000 000D114F 00000000 '
 '00000000 00000000 00000000 00000000 00000000')
'COMM:iTunes_CDDB_IDs:eng'                          '36+840EA15B0842122731C755C7A9299A59+8536959'
'TALB' (Album/Movie/Show title)                     'Nodame Cantabile Best100'
'TBPM' (BPM (beats per minute))                     '142.9'
'TCOM' (Composer)                                   'Brahms, Johannes'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '1967'
'TENC' (Encoded by)                                 'iTunes v7.0.2.16'
'TIT2' (Title/songname/content description)         'Variation on a theme by Paganini, Op.35 - Book II, Variation 2'
'TKEY' (Initial key)                                '8B'
'TPE1' (Lead performer(s)/Soloist(s))               'Gary Graffman'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TPOS' (Part of a set)                              '8/8'
'TRCK' (Track number/Position in set)               '18/36'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '4'
'TXXX:Q-PLAY'                                       '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  'classical'
'TXXX:lastfmtags'                                   ['american', 'piano', 'composer', 'classical', 'classic']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '1'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+2.43 dB'
'TXXX:replaygain_track_peak'                        '0.592429'

========================== row from database ==========================
                                              'id'  329435
                                            'path'  /data/Music/Bulk/00instruments-classical/Compilations/Nodame Cantabile Best100/8-18 Variation on a theme by Paganini, Op.35 - Book II, Variation 2.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  35
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  905698
                                           'mtime'  1637329788
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical Compilations 8 18 prerock classical or classical instruments
                                      'tag_artist'  Gary Graffman
                                     'tag_release'  Nodame Cantabile Best100
                                       'tag_title'  Variation on a theme by Paganini, Op.35 - Book II, Variation 2
                                             'bpm'  142.9
                                    'search_title'  '2':14 '35':9 'a':3 'book':11 'by':5 'ii':12,13 'on':2 'op':8 'op35':10 'paganini':6,7 'theme':4 'variation':1
                                   'search_artist'  'gary':1 'graffman':2
                                  'search_release'  'best100':3 'cantabile':2 'nodame':1
                                     'search_rest'  '00instruments':1 '18':5 '8':4 'classical':2 'compilations':3 'instruments':8 'or':7 'prerock':6
                                    'search_combo'  '00instruments':20 '18':24 '2':14A '35':9A '8':23 'a':3A 'best100':19C 'book':11A 'by':5A 'cantabile':18C 'classical':21 'compilations':22 'gary':15B 'graffman':16B 'ii':12A,13A 'instruments':27 'nodame':17C 'on':2A 'op':8A 'op35':10A 'or':26 'paganini':6A,7A 'prerock':25 'theme':4A 'variation':1A
                                    'tag_tracknum'  18
                                      'num_images'  1
                                             'key'  8B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-mixbeat-1', 'Q-PIANO-4', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-1', 'Q-HAP-2', 'Q-PLAY-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['american', 'piano', 'composer', 'classical', 'classic']
                                        'tag_date'  1967
                                     'discogstags'  ['classical']

============================== file details ==============================
                                           'mtime'  1637329787.605155  (2021-11-19 14:49:47)
                             'size'  905698