======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '243'
                                          'artist'  'The Arrogant Worms'
                                     'text_people'  ''
                                         'release'  'Dirt!'
                                           'title'  "Steel Drivin' Man"
                                           'quals'  "['q-bass-4', 'q-drums-2', 'q-other-2', 'q-piano-1', 'q-vocals-4']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '2'
                                      'tracktotal'  ''
                                            'date'  '1999'
                                        'comments'  ''
                                           'genre'  'Folk'
                                             'bpm'  '102.6'
                                             'key'  '9B'
                                        'acoustid'  ''
rest: ''

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

'POPM:'                                             POPM(email='', rating=153)
'PRIV:www.mexp.dk:\x01\x07\x00\x00\x00\x00active\x01\x06\x00\x00\x00\x00funny\x01\x05\x00\x00\x00\x00folk\x01\x0b\x00\x00\x00\x00good stuff'  PRIV(owner='www.mexp.dk', data=b'\x01\x07\x00\x00\x00\x00active\x01\x06\x00\x00\x00\x00funny\x01\x05\x00\x00\x00\x00folk\x01\x0b\x00\x00\x00\x00good stuff')
'TALB' (Album/Movie/Show title)                     'Dirt!'
'TBPM' (BPM (beats per minute))                     '102.6'
'TCON' (Content type, a.k.a. Genre)                 'Folk'
'TDOR' (Original release time)                      '1999'
'TIT2' (Title/songname/content description)         "Steel Drivin' Man"
'TKEY' (Initial key)                                '9B'
'TMED' (Media type)                                 'DIG'
'TPE1' (Lead performer(s)/Soloist(s))               'The Arrogant Worms'
'TRCK' (Track number/Position in set)               '2'
'TXXX:MusicBrainz Album Id'                         'd7c4ee36-fdb6-4c0f-a66e-2158b4ff9bde'
'TXXX:MusicBrainz Album Release Country'            'CA'
'TXXX:MusicBrainz Album Status'                     'official'
'TXXX:MusicBrainz Album Type'                       'album'
'TXXX:MusicBrainz Artist Id'                        'e18a07b6-2df5-47ca-a3fc-6dbd3a2ef8cc'
'TXXX:MusicBrainz TRM Id'                           '7c4b6553-56d1-475d-9601-30f7ca247975'
'TXXX:q-bass'                                       '4'
'TXXX:q-drums'                                      '2'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-vocals'                                     '4'
'UFID:http://musicbrainz.org'                       UFID(owner='http://musicbrainz.org', data=b'a65154a0-4360-4d3d-b2b7-34aca48eeb8e')
'UFID:musicbrainz'                                  UFID(owner='musicbrainz', data=b'a65154a0-4360-4d3d-b2b7-34aca48eeb8e')

========================== row from database ==========================
                                              'id'  1538749
                                            'path'  /data/Music/Other/PrevSet/[9amusing]/The Arrogant Worms/Steel Drivin' Man.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  243
                                           'genre'  Folk
                                        'filesize'  3895296
                                           'mtime'  1662800507
                                   'redo_metaread'  0
                                        'rest_str'   PrevSet [9amusing] Folk
                                      'tag_artist'  The Arrogant Worms
                                     'tag_release'  Dirt!
                                       'tag_title'  Steel Drivin' Man
                                             'bpm'  102.6
                                    'search_title'  'drivin':2,3 'man':4 'steel':1
                                   'search_artist'  'arrogant':2 'the':1 'worms':3
                                  'search_release'  'dirt':1
                                     'search_rest'  '9amusing':2,3 'folk':4 'prev':5 'prevset':1 'set':6
                                    'search_combo'  '9amusing':10,11 'arrogant':6B 'dirt':8C 'drivin':2A,3A 'folk':12 'man':4A 'prev':13 'prevset':9 'set':14 'steel':1A 'the':5B 'worms':7B
                                    'tag_tracknum'  2
                                      'num_images'  0
                                             'key'  9B
                                           'quals'  ['q-bass-4', 'q-drums-2', 'q-other-2', 'q-piano-1', 'q-vocals-4']
                                      'lastfmtags'  []
                                        'tag_date'  1999
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1662800506.7102566  (2022-09-10 11:01:46)
                             'size'  3895296