======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '481'
                                          'artist'  'Led Zeppelin'
                                     'text_people'  'Jimmy Page & Robert Plant'
                                         'release'  'Led Zeppelin IV'
                                           'title'  'Stairway to Heaven'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-2', 'q-syn-2', 'q-bass-3', 'q-busy-3', 'q-grit-3', 'q-play-3', "
 "'q-chart-4', 'q-drums-3', 'q-other-4', 'q-piano-1', 'q-vocals-2', "
 "'q-mixbeat-2']")
                                      'lastfmtags'  "['hard rock', 'rock', 'progressive rock', '70s', 'classic rock']"
                                     'discogstags'  "['rock', 'classic rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '4'
                                      'tracktotal'  ''
                                            'date'  '1971'
                                        'comments'  ''
                                           'genre'  'rock-cppex-progressive'
                                             'bpm'  '135.6'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'PRIV:AverageLevel:\x08\r\x00\x00'                  PRIV(owner='AverageLevel', data=b'\x08\r\x00\x00')
'PRIV:PeakValue:ΓΏ\x7f\x00\x00'                      PRIV(owner='PeakValue', data=b'\xff\x7f\x00\x00')
'TALB' (Album/Movie/Show title)                     'Led Zeppelin IV'
'TBPM' (BPM (beats per minute))                     '135.6'
'TCOM' (Composer)                                   'Jimmy Page & Robert Plant'
'TCON' (Content type, a.k.a. Genre)                 'rock-cppex-progressive'
'TDRC' (Recording time)                             '1971'
'TIT2' (Title/songname/content description)         'Stairway to Heaven'
'TKEY' (Initial key)                                '8A'
'TLEN' (Length)                                     '481149'
'TPE1' (Lead performer(s)/Soloist(s))               'Led Zeppelin'
'TRCK' (Track number/Position in set)               '4'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  ['rock', 'classic rock']
'TXXX:lastfmtags'                                   ['hard rock', 'rock', 'progressive rock', '70s', 'classic rock']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '3'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '2'
'TXXX:replaygain_track_gain'                        '+0.85 dB'
'TXXX:replaygain_track_peak'                        '0.718093'

========================== row from database ==========================
                                              'id'  1409925
                                            'path'  /data/Music/Bulk/00popandrock-classicprogpsy/Led Zeppelin/Led Zeppelin IV/Led Zeppelin - (1971) Led Zeppelin IV - 04 - Stairway to Heaven.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  481
                                           'genre'  rock-cppex-progressive
                                        'filesize'  7699225
                                           'mtime'  1620736230
                                   'redo_metaread'  0
                                        'rest_str'   00popandrock classicprogpsy (1971) 04 rock cppex progressive
                                      'tag_artist'  Led Zeppelin
                                     'tag_release'  Led Zeppelin IV
                                       'tag_title'  Stairway to Heaven
                                             'bpm'  135.6
                                    'search_title'  'heaven':3 'stairway':1 'to':2
                                   'search_artist'  'led':1 'zeppelin':2
                                  'search_release'  'iv':3 'led':1 'zeppelin':2
                                     'search_rest'  '1971':2,3 'classicprogpsy':1 'cppex':5 'progressive':6 'rock':4
                                    'search_combo'  '1971':10,11 'classicprogpsy':9 'cppex':13 'heaven':3A 'iv':8C 'led':4B,6C 'progressive':14 'rock':12 'stairway':1A 'to':2A 'zeppelin':5B,7C
                                    'tag_tracknum'  4
                                      'num_images'  0
                                             'key'  8A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-2', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-2', 'q-play-3', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-3', 'q-syn-2', 'q-chart-4', 'q-other-4', 'Q-HAP-3', 'q-bass-3', 'q-grit-3']
                                      'lastfmtags'  ['hard rock', 'rock', 'progressive rock', '70s', 'classic rock']
                                        'tag_date'  1971
                                     'discogstags'  ['rock', 'classic rock']

============================== file details ==============================
                                           'mtime'  1620736230.4956489  (2021-05-11 14:30:30)
                             'size'  7699225