======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '507'
                                          'artist'  'Led Zeppelin'
                                     'text_people'  ''
                                         'release'  'The Song Remains the Same (dis'
                                           'title'  'Rain Song'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-2', 'q-syn-2', 'q-bass-4', 'q-busy-3', 'q-grit-3', 'q-play-3', "
 "'q-chart-4', 'q-drums-3', 'q-other-3', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-2']")
                                      'lastfmtags'  "['hard rock', 'rock', 'progressive rock', '70s', 'classic rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '4'
                                      'tracktotal'  ''
                                            'date'  '1976'
                                        'comments'  ''
                                           'genre'  'rock-cppex-progressive'
                                             'bpm'  '135.004'
                                             'key'  '11B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'The Song Remains the Same (dis'
'TBPM' (BPM (beats per minute))                     '135.004'
'TCON' (Content type, a.k.a. Genre)                 'rock-cppex-progressive'
'TDRC' (Recording time)                             '1976'
'TIT2' (Title/songname/content description)         'Rain Song'
'TKEY' (Initial key)                                '11B'
'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:lastfmtags'                                   ['hard rock', 'rock', 'progressive rock', '70s', 'classic rock']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '3'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+1.98 dB'
'TXXX:replaygain_track_peak'                        '0.760266'

========================== row from database ==========================
                                              'id'  1410296
                                            'path'  /data/Music/Bulk/00popandrock-classicprogpsy/Led Zeppelin/MBZ;#Led Zeppelin;#The Song Remains the Same (disc 1);#04;#Rain Song.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  507
                                           'genre'  rock-cppex-progressive
                                        'filesize'  8126106
                                           'mtime'  1620736242
                                   'redo_metaread'  0
                                        'rest_str'   00popandrock classicprogpsy MBZ;#Led Zeppelin;#The (disc 1);#04;#Rain rock cppex progressive
                                      'tag_artist'  Led Zeppelin
                                     'tag_release'  The Song Remains the Same (dis
                                       'tag_title'  Rain Song
                                             'bpm'  135.004
                                    'search_title'  'rain':1 'song':2
                                   'search_artist'  'led':1 'zeppelin':2
                                  'search_release'  'dis':5,6 'remains':3 'same':4 'song':2 'the':1
                                     'search_rest'  '04':13,16 '1':12,15 'classicprogpsy':1 'cppex':19 'disc':10,11 'led':3,5 'mbz':2,4 'progressive':20 'rain':14,17 'rock':18 'the':7,9 'zeppelin':6,8
                                    'search_combo'  '04':23,26 '1':22,25 'classicprogpsy':11 'cppex':29 'dis':9C,10C 'disc':20,21 'led':3B,13,15 'mbz':12,14 'progressive':30 'rain':1A,24,27 'remains':7C 'rock':28 'same':8C 'song':2A,6C 'the':5C,17,19 'zeppelin':4B,16,18
                                    'tag_tracknum'  4
                                      'num_images'  0
                                             'key'  11B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', '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-3', 'Q-HAP-3', 'q-bass-4', 'q-grit-3']
                                      'lastfmtags'  ['hard rock', 'rock', 'progressive rock', '70s', 'classic rock']
                                        'tag_date'  1976
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620736242.436578  (2021-05-11 14:30:42)
                             'size'  8126106