======================== unified (from filesystem) ========================
                                         'bitrate'  '256.0'
                                        'duration'  '37'
                                          'artist'  'The Bonzo Dog Band'
                                     'text_people'  ''
                                         'release'  'Vol. 1: The Intro'
                                           'title'  'Karma Sutra'
                                           'quals'  "['q-bass-4', 'q-drums-4', 'q-other-1', 'q-piano-2', 'q-vocals-2']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '21'
                                      'tracktotal'  ''
                                            'date'  '1968'
                                        'comments'  ''
                                           'genre'  'Oldies'
                                             'bpm'  '113.5'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

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

'POPM:'                                             POPM(email='', rating=102)
'PRIV:www.mexp.dk:\x01\x0b\x00\x00\x00\x00good stuff\x01\x07\x00\x00\x00\x00active\x01\t\x00\x00\x00\x00cheerful\x01\x08\x00\x00\x00\x00amusing'  PRIV(owner='www.mexp.dk', data=b'\x01\x0b\x00\x00\x00\x00good stuff\x01\x07\x00\x00\x00\x00active\x01\t\x00\x00\x00\x00cheerful\x01\x08\x00\x00\x00\x00amusing')
'TALB' (Album/Movie/Show title)                     'Vol. 1: The Intro'
'TBPM' (BPM (beats per minute))                     '113.5'
'TCON' (Content type, a.k.a. Genre)                 'Oldies'
'TDOR' (Original release time)                      '1992'
'TDRC' (Recording time)                             '1968'
'TIT2' (Title/songname/content description)         'Karma Sutra'
'TKEY' (Initial key)                                '9A'
'TPE1' (Lead performer(s)/Soloist(s))               'The Bonzo Dog Band'
'TRCK' (Track number/Position in set)               '21'
'TXXX:MusicBrainz Album Id'                         'f1ead58f-96dc-4251-9c41-357f6d09cbc0'
'TXXX:MusicBrainz Album Release Country'            'GB'
'TXXX:MusicBrainz Album Status'                     'official'
'TXXX:MusicBrainz Album Type'                       'compilation'
'TXXX:MusicBrainz Artist Id'                        '2fe8f530-861d-40ff-ac74-51f7e2701965'
'TXXX:MusicBrainz TRM Id'                           '01b6fbc3-9782-454f-b771-95489432fa88'
'TXXX:q-bass'                                       '4'
'TXXX:q-drums'                                      '4'
'TXXX:q-other'                                      '1'
'TXXX:q-piano'                                      '2'
'TXXX:q-vocals'                                     '2'
'UFID:http://musicbrainz.org'                       UFID(owner='http://musicbrainz.org', data=b'cebd5cfa-3297-4f65-b016-113bca84ed49')

========================== row from database ==========================
                                              'id'  1538716
                                            'path'  /data/Music/Other/PrevSet/[8ohdear]/Bonzo Dog/Karma Sutra.mp3
                                         'working'  None
                                         'bitrate'  256
                                    'duration_sec'  37
                                           'genre'  Oldies
                                        'filesize'  1188014
                                           'mtime'  1662800424
                                   'redo_metaread'  0
                                        'rest_str'   PrevSet [8ohdear] Oldies
                                      'tag_artist'  The Bonzo Dog Band
                                     'tag_release'  Vol. 1: The Intro
                                       'tag_title'  Karma Sutra
                                             'bpm'  113.5
                                    'search_title'  'karma':1 'sutra':2
                                   'search_artist'  'band':4 'bonzo':2 'dog':3 'the':1
                                  'search_release'  '1':3,4 'intro':6 'the':5 'vol':1,2
                                     'search_rest'  '8ohdear':2,3 'oldies':4 'prev':5 'prevset':1 'set':6
                                    'search_combo'  '1':9C,10C '8ohdear':14,15 'band':6B 'bonzo':4B 'dog':5B 'intro':12C 'karma':1A 'oldies':16 'prev':17 'prevset':13 'set':18 'sutra':2A 'the':3B,11C 'vol':7C,8C
                                    'tag_tracknum'  21
                                      'num_images'  0
                                             'key'  9A
                                           'quals'  ['q-bass-4', 'q-drums-4', 'q-other-1', 'q-piano-2', 'q-vocals-2']
                                      'lastfmtags'  []
                                        'tag_date'  1968
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1662800423.948928  (2022-09-10 11:00:23)
                             'size'  1188014