======================== unified (from filesystem) ========================
                                         'bitrate'  '188.552'
                                        'duration'  '231'
                                          'artist'  'Freddie Mercury & Montserrat Caballi'
                                     'text_people'  ''
                                         'release'  'The Very Best of Freddie Mercury Solo [Disc 1]'
                                           'title'  'How Can I Go On'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-2', 'q-syn-2', 'q-bass-3', 'q-busy-3', 'q-grit-2', 'q-play-3', "
 "'q-chart-3', 'q-drums-2', 'q-other-2', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-2']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '8'
                                      'tracktotal'  '20'
                                            'date'  '1988'
                                        'comments'  ''
                                           'genre'  'rock-cppex-classic'
                                             'bpm'  '121.774'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'The Very Best of Freddie Mercury Solo [Disc 1]'
'TBPM' (BPM (beats per minute))                     '121.774'
'TCON' (Content type, a.k.a. Genre)                 'rock-cppex-classic'
'TDRC' (Recording time)                             '1988'
'TIT2' (Title/songname/content description)         'How Can I Go On'
'TKEY' (Initial key)                                '9A'
'TPE1' (Lead performer(s)/Soloist(s))               'Freddie Mercury & Montserrat Caballi'
'TPOS' (Part of a set)                              '1/2'
'TRCK' (Track number/Position in set)               '8/20'
'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-UNU'                                        '1'
'TXXX:UFIDhttp://www.cddb.com/id3/taginfo1.html'    '3CD3N65Q110954320U53850F1F762CC3B498AD0CC587898432162P3'
'TXXX:iTunes_CDDB_IDs'                              '20++'
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '-0.60 dB'
'TXXX:replaygain_track_peak'                        '0.525051'
'TXXX:tempo'                                        '00000 BPM'

========================== row from database ==========================
                                              'id'  1411577
                                            'path'  /data/Music/Bulk/00popandrock-classicprogpsy/Freddie Mercury/The Very Best Of Freddie Mercury Solo [Disc 1]/1-08 How Can I Go On.mp3
                                         'working'  None
                                         'bitrate'  188
                                    'duration_sec'  231
                                           'genre'  rock-cppex-classic
                                        'filesize'  5461812
                                           'mtime'  1636038720
                                   'redo_metaread'  0
                                        'rest_str'   00popandrock classicprogpsy Of 08 rock cppex classic
                                      'tag_artist'  Freddie Mercury & Montserrat Caballi
                                     'tag_release'  The Very Best of Freddie Mercury Solo [Disc 1]
                                       'tag_title'  How Can I Go On
                                             'bpm'  121.774
                                    'search_title'  'can':2 'go':4 'how':1 'i':3 'on':5
                                   'search_artist'  'caballi':4 'freddie':1 'mercury':2 'montserrat':3
                                  'search_release'  '1':10,11 'best':3 'disc':8,9 'freddie':5 'mercury':6 'of':4 'solo':7 'the':1 'very':2
                                     'search_rest'  'classic':5 'classicprogpsy':1 'cppex':4 'of':2 'rock':3
                                    'search_combo'  '1':19C,20C 'best':12C 'caballi':9B 'can':2A 'classic':25 'classicprogpsy':21 'cppex':24 'disc':17C,18C 'freddie':6B,14C 'go':4A 'how':1A 'i':3A 'mercury':7B,15C 'montserrat':8B 'of':13C,22 'on':5A 'rock':23 'solo':16C 'the':10C 'very':11C
                                    'tag_tracknum'  8
                                      'num_images'  0
                                             'key'  9A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-2', 'q-play-3', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-2', 'q-syn-2', 'q-chart-3', 'q-other-2', 'Q-HAP-3', 'q-bass-3', 'q-grit-2']
                                      'lastfmtags'  []
                                        'tag_date'  1988
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1636038720.307523  (2021-11-04 16:12:00)
                             'size'  5461812