======================== unified (from filesystem) ========================
                                         'bitrate'  '261.609'
                                        'duration'  '64'
                                          'artist'  ''
                                     'text_people'  'Carl Philipp Emanuel Bach'
                                         'release'  'Piano Classics'
                                           'title'  'Solfeggietto'
                                           'quals'  ("['Q-HAP-2', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-JZFKS-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'Q-PLAY-3', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-1', "
 "'Q-PIANO-4', 'q-chart-3', 'q-drums-1', 'q-other-2', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['trance', 'jazz', 'electronic', 'techno', 'rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '4'
                                      'tracktotal'  '20'
                                            'date'  '2001'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '137.7'
                                             'key'  '5A'
                                        'acoustid'  ''
rest: ''

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

'COMM:iTunNORM:eng'                                 (' 000001FB 000002A5 0000146D 00001AC8 0000B3CB 000061F5 0000514C 00006C81 '
 '0000610A 00005D43')
'COMM:iTunPGAP:eng'                                 '0'
'COMM:iTunSMPB:eng'                                 (' 00000000 00000210 00000B40 00000000002B1A30 00000000 001FE932 00000000 '
 '00000000 00000000 00000000 00000000 00000000')
'COMM:iTunes_CDDB_IDs:eng'                          '20+B1E27A5B4860A967AD97B8CB865D7530+8809364'
'TALB' (Album/Movie/Show title)                     'Piano Classics'
'TBPM' (BPM (beats per minute))                     '137.7'
'TCOM' (Composer)                                   'Carl Philipp Emanuel Bach'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '2001'
'TENC' (Encoded by)                                 'iTunes 9.0.3'
'TIT2' (Title/songname/content description)         'Solfeggietto'
'TKEY' (Initial key)                                '5A'
'TPE1' (Lead performer(s)/Soloist(s))               'Various Artists'
'TPOS' (Part of a set)                              '1/1'
'TRCK' (Track number/Position in set)               '4/20'
'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:lastfmtags'                                   ['trance', 'jazz', 'electronic', 'techno', 'rock']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+1.17 dB'
'TXXX:replaygain_track_peak'                        '0.713075'

========================== row from database ==========================
                                              'id'  281842
                                            'path'  /data/Music/Bulk/00instruments-classical/Compilations/Piano Classics/04 Solfeggietto.mp3
                                         'working'  None
                                         'bitrate'  261
                                    'duration_sec'  64
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  2100457
                                           'mtime'  1637329787
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical Compilations 04 prerock classical or classical instruments
                                      'tag_artist'  Various Artists
                                     'tag_release'  Piano Classics
                                       'tag_title'  Solfeggietto
                                             'bpm'  137.7
                                    'search_title'  'solfeggietto':1
                                   'search_artist'  'artists':2 'various':1
                                  'search_release'  'classics':2 'piano':1
                                     'search_rest'  '00instruments':1 'classical':2 'compilations':3 'instruments':6 'or':5 'prerock':4
                                    'search_combo'  '00instruments':4 'classical':5 'classics':3C 'compilations':6 'instruments':9 'or':8 'piano':2C 'prerock':7 'solfeggietto':1A
                                    'tag_tracknum'  4
                                      'num_images'  0
                                             'key'  5A
                                           '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-2', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-2', 'Q-HAP-2', 'Q-PLAY-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['trance', 'jazz', 'electronic', 'techno', 'rock']
                                        'tag_date'  2001
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1637329786.885818  (2021-11-19 14:49:46)
                             'size'  2100457