======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '265'
                                          'artist'  'Marx & Spencer'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Stay'
                                           'quals'  "['q-bass-4', 'q-drums-4', 'q-other-1', 'q-piano-1', 'q-vocals-2']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '07'
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'pop,eighties,zomgeighties'
                                             'bpm'  '84.0'
                                             'key'  '10A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '84.0'
'TCON' (Content type, a.k.a. Genre)                 'pop,eighties,zomgeighties'
'TIT2' (Title/songname/content description)         'Stay'
'TKEY' (Initial key)                                '10A'
'TPE1' (Lead performer(s)/Soloist(s))               'Marx & Spencer'
'TRCK' (Track number/Position in set)               '07'
'TXXX:q-bass'                                       '4'
'TXXX:q-drums'                                      '4'
'TXXX:q-other'                                      '1'
'TXXX:q-piano'                                      '1'
'TXXX:q-vocals'                                     '2'
'TXXX:replaygain_track_gain'                        '+0.38 dB'
'TXXX:replaygain_track_peak'                        '0.592826'

========================== row from database ==========================
                                              'id'  1538387
                                            'path'  /data/Music/Other/PrevSet/[7zomgeighties]/Marx & Spencer - Stay.mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  265
                                           'genre'  pop,eighties,zomgeighties
                                        'filesize'  10649320
                                           'mtime'  1662800520
                                   'redo_metaread'  0
                                        'rest_str'   PrevSet [7zomgeighties] pop,eighties,zomgeighties
                                      'tag_artist'  Marx & Spencer
                                     'tag_release'  None
                                       'tag_title'  Stay
                                             'bpm'  84.0
                                    'search_title'  'stay':1
                                   'search_artist'  'marx':1 'spencer':2
                                  'search_release'  
                                     'search_rest'  '7zomgeighties':2,3 'eighties':5,8 'pop':4,7 'prev':10 'prevset':1 'set':11 'zomgeighties':6,9
                                    'search_combo'  '7zomgeighties':5,6 'eighties':8,11 'marx':2B 'pop':7,10 'prev':13 'prevset':4 'set':14 'spencer':3B 'stay':1A 'zomgeighties':9,12
                                    'tag_tracknum'  7
                                      'num_images'  0
                                             'key'  10A
                                           'quals'  ['q-bass-4', 'q-drums-4', 'q-other-1', 'q-piano-1', 'q-vocals-2']
                                      'lastfmtags'  []
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1662800519.9378297  (2022-09-10 11:01:59)
                             'size'  10649320