======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '190'
                                          'artist'  'Voltaire'
                                     'text_people'  'Goeke/Grant/Gregor Kitzis/Voltaire'
                                         'release'  'Boo Hoo'
                                           'title'  'The Vampire Club'
                                           'quals'  "['q-bass-3', 'q-drums-2', 'q-other-3', 'q-piano-1', 'q-vocals-3']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '9'
                                      'tracktotal'  ''
                                            'date'  '2002'
                                        'comments'  ''
                                           'genre'  'rock'
                                             'bpm'  '114.1'
                                             'key'  'F m'  (4A)
                                        'acoustid'  ''
rest: ''

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

'POPM:\x01ÿþ3'                                      POPM(email='\x01ÿþ3', rating=153, count=0)
'TALB' (Album/Movie/Show title)                     'Boo Hoo'
'TBPM' (BPM (beats per minute))                     '114.1'
'TCOM' (Composer)                                   'Goeke/Grant/Gregor Kitzis/Voltaire'
'TCON' (Content type, a.k.a. Genre)                 'rock'
'TDRC' (Recording time)                             '2002'
'TIT2' (Title/songname/content description)         'The Vampire Club'
'TKEY' (Initial key)                                'F m'
'TPE1' (Lead performer(s)/Soloist(s))               'Voltaire'
'TPE2' (Band/orchestra/accompaniment)               'Voltaire'
'TPUB' (Publisher)                                  'Projekt'
'TRCK' (Track number/Position in set)               '9'
'TXXX:FMPS_Rating'                                  '0.6'
'TXXX:q-bass'                                       '3'
'TXXX:q-drums'                                      '2'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '-0.67 dB'
'TXXX:replaygain_track_peak'                        '0.478530'

========================== row from database ==========================
                                              'id'  1538450
                                            'path'  /data/Music/Other/PrevSet/[8ohdear]/Voltaire/The Vampire Club.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  190
                                           'genre'  rock
                                        'filesize'  3809899
                                           'mtime'  1657677162
                                   'redo_metaread'  0
                                        'rest_str'   PrevSet [8ohdear] rock
                                      'tag_artist'  Voltaire
                                     'tag_release'  Boo Hoo
                                       'tag_title'  The Vampire Club
                                             'bpm'  114.1
                                    'search_title'  'club':3 'the':1 'vampire':2
                                   'search_artist'  'voltaire':1
                                  'search_release'  'boo':1 'hoo':2
                                     'search_rest'  '8ohdear':2,3 'prev':5 'prevset':1 'rock':4 'set':6
                                    'search_combo'  '8ohdear':8,9 'boo':5C 'club':3A 'hoo':6C 'prev':11 'prevset':7 'rock':10 'set':12 'the':1A 'vampire':2A 'voltaire':4B
                                    'tag_tracknum'  9
                                      'num_images'  0
                                             'key'  F m
                                           'quals'  ['q-bass-3', 'q-drums-2', 'q-other-3', 'q-piano-1', 'q-vocals-3']
                                      'lastfmtags'  []
                                        'tag_date'  2002
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1657677161.951745  (2022-07-13 03:52:41)
                             'size'  3809899