======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '588'
                                          'artist'  'Sergei Rachmaninoff'
                                     'text_people'  ''
                                         'release'  'Rachmaninoff Plays Rachmaninof'
                                           'title'  'Concerto No. 4 in G minor,Op.4'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'Q-PLAY-3', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-2', "
 "'Q-PIANO-2', 'q-chart-3', 'q-drums-1', 'q-other-4', 'q-vocals-2', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['russian', 'composers', 'piano', 'romantic', 'classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '4'
                                      'tracktotal'  ''
                                            'date'  '1941'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '141.216'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Rachmaninoff Plays Rachmaninof'
'TBPM' (BPM (beats per minute))                     '141.216'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '1941'
'TIT2' (Title/songname/content description)         'Concerto No. 4 in G minor,Op.4'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Sergei Rachmaninoff'
'TRCK' (Track number/Position in set)               '4'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '2'
'TXXX:Q-PLAY'                                       '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['russian', 'composers', 'piano', 'romantic', 'classical']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '2'
'TXXX:replaygain_track_gain'                        '+1.54 dB'
'TXXX:replaygain_track_peak'                        '0.906779'

========================== row from database ==========================
                                              'id'  174338
                                            'path'  /data/Music/Bulk/00instruments-classical/Sergei Rachmaninoff - Rachmaninoff plays Rachmaninoff/CD1/04Concerto No. 4 in G minor,Op.40 - Allegro vivace-Rachmaninoff Plays Rachmaninoff,Sergei Rachmaninoff.mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  588
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  23532914
                                           'mtime'  1620574230
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical plays CD1 04Concerto minor,Op.40 Allegro vivace Rachmaninoff,Sergei prerock classical classical instruments
                                      'tag_artist'  Sergei Rachmaninoff
                                     'tag_release'  Rachmaninoff Plays Rachmaninof
                                       'tag_title'  Concerto No. 4 in G minor,Op.4
                                             'bpm'  141.216
                                    'search_title'  '4':4,9 'concerto':1 'g':6 'in':5 'minor':7,10 'no':2,3 'op':8 'op4':11
                                   'search_artist'  'rachmaninoff':2 'sergei':1
                                  'search_release'  'plays':2 'rachmaninof':3 'rachmaninoff':1
                                     'search_rest'  '00instruments':1 '04concerto':5 '40':8 'allegro':11 'cd1':4 'classical':2 'instruments':18 'minor':6,9 'op':7 'op40':10 'plays':3 'prerock':17 'rachmaninoff':13,15 'sergei':14,16 'vivace':12
                                    'search_combo'  '00instruments':17 '04concerto':21 '4':4A,9A '40':24 'allegro':27 'cd1':20 'classical':18 'concerto':1A 'g':6A 'in':5A 'instruments':34 'minor':7A,10A,22,25 'no':2A,3A 'op':8A,23 'op4':11A 'op40':26 'plays':15C,19 'prerock':33 'rachmaninof':16C 'rachmaninoff':13B,14C,29,31 'sergei':12B,30,32 'vivace':28
                                    'tag_tracknum'  4
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-2', 'Q-LOCALNESS-1', 'q-mixbeat-1', 'Q-PIANO-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-4', 'Q-HAP-3', 'Q-PLAY-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['russian', 'composers', 'piano', 'romantic', 'classical']
                                        'tag_date'  1941
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620574230.3574967  (2021-05-09 17:30:30)
                             'size'  23532914