======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '837'
                                          'artist'  'Sergei Rachmaninoff'
                                     'text_people'  ''
                                         'release'  'Rachmaninoff plays Rachmaninof'
                                           'title'  'Concerto no.3 in D minor, Op.3'
                                           '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-1', "
 "'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'  '139.178'
                                             'key'  '7A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Rachmaninoff plays Rachmaninof'
'TBPM' (BPM (beats per minute))                     '139.178'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '1941'
'TIT2' (Title/songname/content description)         'Concerto no.3 in D minor, Op.3'
'TKEY' (Initial key)                                '7A'
'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'                                     '1'
'TXXX:replaygain_track_gain'                        '+2.44 dB'
'TXXX:replaygain_track_peak'                        '0.808309'

========================== row from database ==========================
                                              'id'  176598
                                            'path'  /data/Music/Bulk/00instruments-classical/Sergei Rachmaninoff - Rachmaninoff plays Rachmaninoff/CD2/04Concerto no.3 in D minor, Op.30 - Allegro ma non tanto-Rachmaninoff plays Rachmaninoff,Sergei Rachmaninoff.mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  837
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  33506668
                                           'mtime'  1620574232
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical CD2 04Concerto Op.30 Allegro non tanto Rachmaninoff,Sergei prerock classical classical instruments
                                      'tag_artist'  Sergei Rachmaninoff
                                     'tag_release'  Rachmaninoff plays Rachmaninof
                                       'tag_title'  Concerto no.3 in D minor, Op.3
                                             'bpm'  139.178
                                    'search_title'  '3':3,10 'concerto':1 'd':6 'in':5 'minor':7,8 'no':2 'no3':4 'op':9 'op3':11
                                   'search_artist'  'rachmaninoff':2 'sergei':1
                                  'search_release'  'plays':2 'rachmaninof':3 'rachmaninoff':1
                                     'search_rest'  '00instruments':1 '04concerto':4 '30':6 'allegro':8 'cd2':3 'classical':2 'instruments':16 'non':9 'op':5 'op30':7 'prerock':15 'rachmaninoff':11,13 'sergei':12,14 'tanto':10
                                    'search_combo'  '00instruments':17 '04concerto':20 '3':3A,10A '30':22 'allegro':24 'cd2':19 'classical':18 'concerto':1A 'd':6A 'in':5A 'instruments':32 'minor':7A,8A 'no':2A 'no3':4A 'non':25 'op':9A,21 'op3':11A 'op30':23 'plays':15C 'prerock':31 'rachmaninof':16C 'rachmaninoff':13B,14C,27,29 'sergei':12B,28,30 'tanto':26
                                    'tag_tracknum'  4
                                      'num_images'  0
                                             'key'  7A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', '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'  1620574231.8305964  (2021-05-09 17:30:31)
                             'size'  33506668