======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '253'
                                          'artist'  'Frou Frou'
                                     'text_people'  ''
                                         'release'  'Details'
                                           'title'  'Let Go'
                                           'quals'  "['q-bass-4', 'q-drums-2', 'q-other-3', 'q-piano-1', 'q-vocals-2']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '1'
                                      'tracktotal'  ''
                                            'date'  '2002'
                                        'comments'  ''
                                           'genre'  'Pop'
                                             'bpm'  '93.3'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'POPM:'                                             POPM(email='', rating=204)
'TALB' (Album/Movie/Show title)                     'Details'
'TBPM' (BPM (beats per minute))                     '93.3'
'TCON' (Content type, a.k.a. Genre)                 'Pop'
'TDRC' (Recording time)                             '2002'
'TENC' (Encoded by)                                 'Exact Audio Copy   (Secure mode)'
'TIT2' (Title/songname/content description)         'Let Go'
'TKEY' (Initial key)                                '8A'
'TPE1' (Lead performer(s)/Soloist(s))               'Frou Frou'
'TRCK' (Track number/Position in set)               '1'
'TXXX:MusicBrainz Album Id'                         '1b3ce475-1250-4700-abd2-fd889dd6db8a'
'TXXX:MusicBrainz Album Status'                     'official'
'TXXX:MusicBrainz Album Type'                       'album'
'TXXX:MusicBrainz Artist Id'                        'd614b0ad-fe3a-4927-b413-48cb831a814b'
'TXXX:MusicBrainz TRM Id'                           'e8747213-8275-426d-80b2-319e197b54c5'
'TXXX:q-bass'                                       '4'
'TXXX:q-drums'                                      '2'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-vocals'                                     '2'
'UFID:http://musicbrainz.org'                       UFID(owner='http://musicbrainz.org', data=b'da120962-6354-427f-9419-69dfd86cc366')

========================== row from database ==========================
                                              'id'  1538804
                                            'path'  /data/Music/Other/PrevSet/[0yay1]/Frou Frou/Let Go.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  253
                                           'genre'  Pop
                                        'filesize'  6080718
                                           'mtime'  1662800164
                                   'redo_metaread'  0
                                        'rest_str'   PrevSet [0yay1] Pop
                                      'tag_artist'  Frou Frou
                                     'tag_release'  Details
                                       'tag_title'  Let Go
                                             'bpm'  93.3
                                    'search_title'  'go':2 'let':1
                                   'search_artist'  'frou':1
                                  'search_release'  'details':1
                                     'search_rest'  '0yay1':2,3 'pop':4 'prev':5 'prevset':1 'set':6
                                    'search_combo'  '0yay1':6,7 'details':4C 'frou':3B 'go':2A 'let':1A 'pop':8 'prev':9 'prevset':5 'set':10
                                    'tag_tracknum'  1
                                      'num_images'  0
                                             'key'  8A
                                           'quals'  ['q-bass-4', 'q-drums-2', 'q-other-3', 'q-piano-1', 'q-vocals-2']
                                      'lastfmtags'  []
                                        'tag_date'  2002
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1662800163.9493222  (2022-09-10 10:56:03)
                             'size'  6080718