======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '146'
                                          'artist'  'Tchaikovsky'
                                     'text_people'  ''
                                         'release'  'Classical Top 100 - Volume 5'
                                           'title'  'Nutcracker Ballet Suite - Marc'
                                           '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-2', "
 "'q-chart-3', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['classical', 'romantic', 'russian', 'composers', 'instrumental']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '12'
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '146.000'
                                             'key'  '10A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Classical Top 100 - Volume 5'
'TBPM' (BPM (beats per minute))                     '146.000'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TIT2' (Title/songname/content description)         'Nutcracker Ballet Suite - Marc'
'TKEY' (Initial key)                                '10A'
'TPE1' (Lead performer(s)/Soloist(s))               'Tchaikovsky'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TRCK' (Track number/Position in set)               '12'
'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:lastfmtags'                                   ['classical', 'romantic', 'russian', 'composers', 'instrumental']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '3'
'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'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+4.04 dB'
'TXXX:replaygain_track_peak'                        '0.872594'

========================== row from database ==========================
                                              'id'  190925
                                            'path'  /data/Music/Bulk/00instruments-classical/Classical Top 100 - Volume 5/MBZ;#Various Artists;#Classical Top 100 - Volume 5;#12;#Nutcracker March.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  146
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  2345197
                                           'mtime'  1620561499
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical MBZ;#Various Artists;#Classical 5;#12;#Nutcracker March prerock classical or classical instruments
                                      'tag_artist'  Tchaikovsky
                                     'tag_release'  Classical Top 100 - Volume 5
                                       'tag_title'  Nutcracker Ballet Suite - Marc
                                             'bpm'  146.0
                                    'search_title'  'ballet':2 'marc':4 'nutcracker':1 'suite':3
                                   'search_artist'  'tchaikovsky':1
                                  'search_release'  '100':3 '5':5 'classical':1 'top':2 'volume':4
                                     'search_rest'  '00instruments':1 '12':12,15 '5':11,14 'artists':7,9 'classical':2,8,10 'instruments':20 'march':17 'mbz':3,5 'nutcracker':13,16 'or':19 'prerock':18 'various':4,6
                                    'search_combo'  '00instruments':11 '100':8C '12':22,25 '5':10C,21,24 'artists':17,19 'ballet':2A 'classical':6C,12,18,20 'instruments':30 'marc':4A 'march':27 'mbz':13,15 'nutcracker':1A,23,26 'or':29 'prerock':28 'suite':3A 'tchaikovsky':5B 'top':7C 'various':14,16 'volume':9C
                                    'tag_tracknum'  12
                                      'num_images'  0
                                             'key'  10A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['classical', 'romantic', 'russian', 'composers', 'instrumental']
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561498.7915525  (2021-05-09 13:58:18)
                             'size'  2345197