======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '297'
                                          'artist'  'Nirvana'
                                     'text_people'  ''
                                         'release'  'Never Mind'
                                           'title'  'Smells Like Teens Spirit'
                                           'quals'  ("['Q-HAP-2', 'Q-UNU-1', 'Q-HHRNBTT-1', 'Q-JZFKS-1', 'Q-LOCALNESS-1', "
 "'Q-OLDST-3', 'q-syn-2', 'q-bass-3', 'q-busy-3', 'q-grit-3', 'q-play-3', "
 "'q-chart-4', 'q-drums-4', 'q-other-3', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['alternative rock', '90s', 'alternative', 'grunge', 'rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1991'
                                        'comments'  ''
                                           'genre'  'rock-gr-grunge'
                                             'bpm'  '116.857'
                                             'key'  '4A'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'TALB' (Album/Movie/Show title)                     'Never Mind'
'TBPM' (BPM (beats per minute))                     '116.857'
'TCON' (Content type, a.k.a. Genre)                 'rock-gr-grunge'
'TDRC' (Recording time)                             '1991'
'TIT2' (Title/songname/content description)         'Smells Like Teens Spirit'
'TKEY' (Initial key)                                '4A'
'TPE1' (Lead performer(s)/Soloist(s))               'Nirvana'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['alternative rock', '90s', 'alternative', 'grunge', 'rock']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '4'
'TXXX:q-grit'                                       '3'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '-0.46 dB'
'TXXX:replaygain_track_peak'                        '0.575762'

========================== row from database ==========================
                                              'id'  1303179
                                            'path'  /data/Music/Bulk/00poprockelectronic/Unsorted/[loose files]/nirvana - smells like teen spirit (1).mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  297
                                           'genre'  rock-gr-grunge
                                        'filesize'  4900909
                                           'mtime'  1636903155
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic Unsorted [loose files] nirvana smells like teen spirit (1) rock gr grunge
                                      'tag_artist'  Nirvana
                                     'tag_release'  Never Mind
                                       'tag_title'  Smells Like Teens Spirit
                                             'bpm'  116.857
                                    'search_title'  'like':2 'smells':1 'spirit':4 'teens':3
                                   'search_artist'  'nirvana':1
                                  'search_release'  'mind':2 'never':1
                                     'search_rest'  '00poprockelectronic':1 '1':12,13 'files':5,6 'gr':15 'grunge':16 'like':9 'loose':3,4 'nirvana':7 'rock':14 'smells':8 'spirit':11 'teen':10 'unsorted':2
                                    'search_combo'  '00poprockelectronic':8 '1':19,20 'files':12,13 'gr':22 'grunge':23 'like':2A,16 'loose':10,11 'mind':7C 'never':6C 'nirvana':5B,14 'rock':21 'smells':1A,15 'spirit':4A,18 'teen':17 'teens':3A 'unsorted':9
                                    'tag_tracknum'  None
                                      'num_images'  1
                                             'key'  4A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-4', 'q-syn-2', 'q-chart-4', 'q-other-3', 'Q-HAP-2', 'q-bass-3', 'q-grit-3']
                                      'lastfmtags'  ['alternative rock', '90s', 'alternative', 'grunge', 'rock']
                                        'tag_date'  1991
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1636903155.2548015  (2021-11-14 16:19:15)
                             'size'  4900909