======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '362'
                                          'artist'  'Recoil'
                                     'text_people'  ''
                                         'release'  'Unsound Methods'
                                           'title'  'Luscious Apparatus'
                                           'quals'  "['q-bass-4', 'q-drums-4', 'q-other-2', 'q-piano-1', 'q-vocals-3']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '03'
                                      'tracktotal'  ''
                                            'date'  '1997'
                                        'comments'  ''
                                           'genre'  ''
                                             'bpm'  '124.3'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Unsound Methods'
'TBPM' (BPM (beats per minute))                     '124.3'
'TDRC' (Recording time)                             '1997'
'TIT2' (Title/songname/content description)         'Luscious Apparatus'
'TKEY' (Initial key)                                '9A'
'TPE1' (Lead performer(s)/Soloist(s))               'Recoil'
'TPE2' (Band/orchestra/accompaniment)               'Recoil'
'TRCK' (Track number/Position in set)               '03'
'TXXX:q-bass'                                       '4'
'TXXX:q-drums'                                      '4'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+0.63 dB'
'TXXX:replaygain_track_peak'                        '0.421865'

========================== row from database ==========================
                                              'id'  1538345
                                            'path'  /data/Music/Other/PrevSet/[9odd]/Maggie Estep/Recoil - Luscious Apparatus.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  362
                                           'genre'  
                                        'filesize'  7262623
                                           'mtime'  1662800611
                                   'redo_metaread'  0
                                        'rest_str'   PrevSet [9odd] Maggie Estep
                                      'tag_artist'  Recoil
                                     'tag_release'  Unsound Methods
                                       'tag_title'  Luscious Apparatus
                                             'bpm'  124.3
                                    'search_title'  'apparatus':2 'luscious':1
                                   'search_artist'  'recoil':1
                                  'search_release'  'methods':2 'unsound':1
                                     'search_rest'  '9odd':2,3 'estep':5 'maggie':4 'prev':6 'prevset':1 'set':7
                                    'search_combo'  '9odd':7,8 'apparatus':2A 'estep':10 'luscious':1A 'maggie':9 'methods':5C 'prev':11 'prevset':6 'recoil':3B 'set':12 'unsound':4C
                                    'tag_tracknum'  3
                                      'num_images'  0
                                             'key'  9A
                                           'quals'  ['q-bass-4', 'q-drums-4', 'q-other-2', 'q-piano-1', 'q-vocals-3']
                                      'lastfmtags'  []
                                        'tag_date'  1997
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1662800610.5949032  (2022-09-10 11:03:30)
                             'size'  7262623