======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '163'
                                          'artist'  'Wolfgang Amadeus Mozart'
                                     'text_people'  ''
                                         'release'  'Requiem'
                                           'title'  'Kyrie eleison'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-2', 'q-play-3', "
 "'q-chart-3', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['instrumental', 'composers', 'piano', 'classical', 'classic']"
                                     'discogstags'  "['classical', 'classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '2'
                                      'tracktotal'  '14'
                                            'date'  '1989'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '145.7'
                                             'key'  '7A'
                                        'acoustid'  ''
rest: ''

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

'COMM:CDDB Disc ID:XXX'                             'CF0D0E0E'
'TALB' (Album/Movie/Show title)                     'Requiem'
'TBPM' (BPM (beats per minute))                     '145.7'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '1989'
'TIT2' (Title/songname/content description)         'Kyrie eleison'
'TKEY' (Initial key)                                '7A'
'TPE1' (Lead performer(s)/Soloist(s))               'Wolfgang Amadeus Mozart'
'TRCK' (Track number/Position in set)               '2/14'
'TSSE' (Software/Hardware and settings used for encoding)  'Audiograbber 1.80, LAME dll 3.92, 192 Kbit/s, Stereo, High quality'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  ['classical', 'classical']
'TXXX:lastfmtags'                                   ['instrumental', 'composers', 'piano', 'classical', 'classic']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+1.94 dB'
'TXXX:replaygain_track_peak'                        '0.750357'

========================== row from database ==========================
                                              'id'  1214074
                                            'path'  /data/Music/Bulk/00instruments-classical/Mozart/Requiem/Mozart - Requiem - 02 - Kyrie eleison.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  163
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  3935233
                                           'mtime'  1620561667
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical 02 prerock classical or classical instruments
                                      'tag_artist'  Wolfgang Amadeus Mozart
                                     'tag_release'  Requiem
                                       'tag_title'  Kyrie eleison
                                             'bpm'  145.7
                                    'search_title'  'eleison':2 'kyrie':1
                                   'search_artist'  'amadeus':2 'mozart':3 'wolfgang':1
                                  'search_release'  'requiem':1
                                     'search_rest'  '00instruments':1 'classical':2 'instruments':5 'or':4 'prerock':3
                                    'search_combo'  '00instruments':7 'amadeus':4B 'classical':8 'eleison':2A 'instruments':11 'kyrie':1A 'mozart':5B 'or':10 'prerock':9 'requiem':6C 'wolfgang':3B
                                    'tag_tracknum'  2
                                      'num_images'  0
                                             'key'  7A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['instrumental', 'composers', 'piano', 'classical', 'classic']
                                        'tag_date'  1989
                                     'discogstags'  ['classical', 'classical']

============================== file details ==============================
                                           'mtime'  1620561667.0277145  (2021-05-09 14:01:07)
                             'size'  3935233