======================== unified (from filesystem) ========================
                                         'bitrate'  '166.017'
                                        'duration'  '258'
                                          'artist'  'Thierry Lang'
                                     'text_people'  'Mike Moran/Freddie Mercury'
                                         'release'  'The Very Best of Freddie Mercury Solo [Disc 1]'
                                           'title'  'Guide Me Home (Piano Version)'
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'q-syn-2', 'Q-PLAY-3', 'q-bass-1', 'q-busy-3', "
 "'q-grit-2', 'Q-JZFKS-1', 'Q-OLDST-2', 'Q-PIANO-4', 'q-chart-2', 'q-drums-1', "
 "'q-other-1', 'q-vocals-1', 'Q-HHRNBTT-1', 'q-mixbeat-2', 'Q-LOCALNESS-1']")
                                      'lastfmtags'  "['jazz', 'piano', 'swiss', 'chamber jazz', 'instrumental']"
                                     'discogstags'  "['jazz']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '20'
                                      'tracktotal'  '20'
                                            'date'  '2006'
                                        'comments'  ''
                                           'genre'  'rock-cppex-classic'
                                             'bpm'  '143.213'
                                             'key'  '5B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'The Very Best of Freddie Mercury Solo [Disc 1]'
'TBPM' (BPM (beats per minute))                     '143.213'
'TCOM' (Composer)                                   'Mike Moran/Freddie Mercury'
'TCON' (Content type, a.k.a. Genre)                 'rock-cppex-classic'
'TDRC' (Recording time)                             '2006'
'TIT2' (Title/songname/content description)         'Guide Me Home (Piano Version)'
'TKEY' (Initial key)                                '5B'
'TPE1' (Lead performer(s)/Soloist(s))               'Thierry Lang'
'TPOS' (Part of a set)                              '1/2'
'TRCK' (Track number/Position in set)               '20/20'
'TXXX:Encoding Params'                              'vers'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-PIANO'                                      '4'
'TXXX:Q-PLAY'                                       '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:UFIDhttp://www.cddb.com/id3/taginfo1.html'    '3CD3M104Q110954332U3882E5956A610428AB55474E2870E8903FCP3'
'TXXX:discogstags'                                  'jazz'
'TXXX:iTunes_CDDB_IDs'                              '20++'
'TXXX:lastfmtags'                                   ['jazz', 'piano', 'swiss', 'chamber jazz', 'instrumental']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '1'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+1.47 dB'
'TXXX:replaygain_track_peak'                        '0.788016'
'TXXX:tempo'                                        '00000 BPM'

========================== row from database ==========================
                                              'id'  1413625
                                            'path'  /data/Music/Bulk/00popandrock-classicprogpsy/Freddie Mercury/The Very Best Of Freddie Mercury Solo [Disc 1]/1-20 Guide Me Home (Piano Version).mp3
                                         'working'  None
                                         'bitrate'  166
                                    'duration_sec'  258
                                           'genre'  rock-cppex-classic
                                        'filesize'  5373784
                                           'mtime'  1636038732
                                   'redo_metaread'  0
                                        'rest_str'   00popandrock classicprogpsy Of 20 rock cppex classic
                                      'tag_artist'  Thierry Lang
                                     'tag_release'  The Very Best of Freddie Mercury Solo [Disc 1]
                                       'tag_title'  Guide Me Home (Piano Version)
                                             'bpm'  143.213
                                    'search_title'  'guide':1 'home':3 'me':2 'piano':4,5 'version':6,7
                                   'search_artist'  'lang':2 'thierry':1
                                  'search_release'  '1':10,11 'best':3 'disc':8,9 'freddie':5 'mercury':6 'of':4 'solo':7 'the':1 'very':2
                                     'search_rest'  '20':3 'classic':6 'classicprogpsy':1 'cppex':5 'of':2 'rock':4
                                    'search_combo'  '1':19C,20C '20':23 'best':12C 'classic':26 'classicprogpsy':21 'cppex':25 'disc':17C,18C 'freddie':14C 'guide':1A 'home':3A 'lang':9B 'me':2A 'mercury':15C 'of':13C,22 'piano':4A,5A 'rock':24 'solo':16C 'the':10C 'thierry':8B 'version':6A,7A 'very':11C
                                    'tag_tracknum'  20
                                      'num_images'  0
                                             'key'  5B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-mixbeat-2', 'Q-PIANO-4', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-2', 'q-chart-2', 'q-other-1', 'Q-HAP-3', 'Q-PLAY-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['jazz', 'piano', 'swiss', 'chamber jazz', 'instrumental']
                                        'tag_date'  2006
                                     'discogstags'  ['jazz']

============================== file details ==============================
                                           'mtime'  1636038731.9644802  (2021-11-04 16:12:11)
                             'size'  5373784