======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '465'
                                          'artist'  'Classical Music For People Who Hate Classical Music'
                                     'text_people'  ''
                                         'release'  'Classical Music For People Who Hate Classical Music (disc 3)'
                                           'title'  'Rossini: Overture to "The Barber of Seville"'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-2', 'q-play-3', "
 "'q-chart-3', 'q-drums-2', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '140.7'
                                             'key'  '10A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Classical Music For People Who Hate Classical Music (disc 3)'
'TBPM' (BPM (beats per minute))                     '140.7'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TFLT' (File type)                                  '/3'
'TIT2' (Title/songname/content description)         'Rossini: Overture to "The Barber of Seville"'
'TKEY' (Initial key)                                '10A'
'TMED' (Media type)                                 '(CD/DD)'
'TPE1' (Lead performer(s)/Soloist(s))               'Classical Music For People Who Hate Classical Music'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '2'
'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'                        '+2.34 dB'
'TXXX:replaygain_track_peak'                        '0.961825'

========================== row from database ==========================
                                              'id'  1214185
                                            'path'  /data/Music/Bulk/00instruments-classical/Rossini_-_Overture_to_-The_Barber_of_Seville-.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  465
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  7444543
                                           'mtime'  1620561769
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical Rossini_ _Overture_to_ The_Barber_of_Seville prerock classical classical instruments
                                      'tag_artist'  Classical Music For People Who Hate Classical Music
                                     'tag_release'  Classical Music For People Who Hate Classical Music (disc 3)
                                       'tag_title'  Rossini: Overture to "The Barber of Seville"
                                             'bpm'  140.7
                                    'search_title'  'barber':6 'of':7 'overture':3 'rossini':1,2 'seville':8 'the':5 'to':4
                                   'search_artist'  'classical':1 'for':3 'hate':6 'music':2 'people':4 'who':5
                                  'search_release'  '3':9,10 'classical':1 'disc':7,8 'for':3 'hate':6 'music':2 'people':4 'who':5
                                     'search_rest'  '00instruments':1 'barber':7 'classical':2 'instruments':11 'of':8 'overture':4 'prerock':10 'rossini':3 'seville':9 'the':6 'to':5
                                    'search_combo'  '00instruments':25 '3':23C,24C 'barber':6A,31 'classical':9B,15C,26 'disc':21C,22C 'for':11B,17C 'hate':14B,20C 'instruments':35 'music':10B,16C 'of':7A,32 'overture':3A,28 'people':12B,18C 'prerock':34 'rossini':1A,2A,27 'seville':8A,33 'the':5A,30 'to':4A,29 'who':13B,19C
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  10A
                                           '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-2', 'q-syn-1', 'q-chart-3', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  []
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561769.4221218  (2021-05-09 14:02:49)
                             'size'  7444543