======================== unified (from filesystem) ========================
                                         'bitrate'  '203.029'
                                        'duration'  '184'
                                          'artist'  'Freddie Mercury'
                                     'text_people'  'Freddie Mercury'
                                         'release'  'The Very Best Of Freddie Mercury Solo [Disc 2]'
                                           'title'  "Let's Turn It On [A Cappella Version]"
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-3', 'q-syn-2', 'q-bass-1', 'q-busy-3', 'q-grit-2', 'q-play-3', "
 "'q-chart-3', 'q-drums-1', 'q-other-1', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-2']")
                                      'lastfmtags'  "['queen', '80s', 'rock', 'pop', 'classic rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '15'
                                      'tracktotal'  '15'
                                            'date'  '2000'
                                        'comments'  ''
                                           'genre'  'rock-cppex-classic'
                                             'bpm'  '130.314'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'The Very Best Of Freddie Mercury Solo [Disc 2]'
'TBPM' (BPM (beats per minute))                     '130.314'
'TCOM' (Composer)                                   'Freddie Mercury'
'TCON' (Content type, a.k.a. Genre)                 'rock-cppex-classic'
'TDRC' (Recording time)                             '2000'
'TIT2' (Title/songname/content description)         "Let's Turn It On [A Cappella Version]"
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Freddie Mercury'
'TPOS' (Part of a set)                              '2/2'
'TRCK' (Track number/Position in set)               '15/15'
'TXXX:Encoding Params'                              'vers'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:UFIDhttp://www.cddb.com/id3/taginfo1.html'    '3CD3N38Q113701687U2085A0756EC958376A7D94BAA17B8E16CF5P4'
'TXXX:iTunes_CDDB_IDs'                              '15++'
'TXXX:lastfmtags'                                   ['queen', '80s', 'rock', 'pop', 'classic rock']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '1'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+1.07 dB'
'TXXX:replaygain_track_peak'                        '0.543201'
'TXXX:tempo'                                        '00000 BPM'

========================== row from database ==========================
                                              'id'  1510564
                                            'path'  /data/Music/Bulk/00popandrock-classicprogpsy/Freddie Mercury/The Very Best Of Freddie Mercury Solo [Disc 2]/2-15 Let_s Turn It On [A Cappella Version].mp3
                                         'working'  None
                                         'bitrate'  203
                                    'duration_sec'  184
                                           'genre'  rock-cppex-classic
                                        'filesize'  4679025
                                           'mtime'  1636038744
                                   'redo_metaread'  0
                                        'rest_str'   00popandrock classicprogpsy 15 Let_s rock cppex classic
                                      'tag_artist'  Freddie Mercury
                                     'tag_release'  The Very Best Of Freddie Mercury Solo [Disc 2]
                                       'tag_title'  Let's Turn It On [A Cappella Version]
                                             'bpm'  130.314
                                    'search_title'  'a':7,8 'cappella':9 'it':5 'let':1 'lets':3 'on':6 's':2 'turn':4 'version':10,11
                                   'search_artist'  'freddie':1 'mercury':2
                                  'search_release'  '2':10,11 'best':3 'disc':8,9 'freddie':5 'mercury':6 'of':4 'solo':7 'the':1 'very':2
                                     'search_rest'  'classic':6 'classicprogpsy':1 'cppex':5 'let':2 'rock':4 's':3
                                    'search_combo'  '2':23C,24C 'a':7A,8A 'best':16C 'cappella':9A 'classic':30 'classicprogpsy':25 'cppex':29 'disc':21C,22C 'freddie':12B,18C 'it':5A 'let':1A,26 'lets':3A 'mercury':13B,19C 'of':17C 'on':6A 'rock':28 's':2A,27 'solo':20C 'the':14C 'turn':4A 'version':10A,11A 'very':15C
                                    'tag_tracknum'  15
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-2', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-2', 'q-chart-3', 'q-other-1', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['queen', '80s', 'rock', 'pop', 'classic rock']
                                        'tag_date'  2000
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1636038744.0726454  (2021-11-04 16:12:24)
                             'size'  4679025