======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '226'
                                          'artist'  'Enrico Caruso'
                                     'text_people'  ''
                                         'release'  '[non-album tracks]'
                                           'title'  "No Ve L' Avevo Detto (Madama Butterfly)"
                                           '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-3', 'q-grit-1', 'q-play-2', "
 "'q-chart-2', 'q-drums-1', 'q-other-2', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1910'
                                        'comments'  ''
                                           'genre'  'prerock-vocal-italian'
                                             'bpm'  '125.2'
                                             'key'  '12A'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'COMM:MusicMatch_Bio:eng'                           'Sound edited by Breda4@hotmail.com'
'TALB' (Album/Movie/Show title)                     '[non-album tracks]'
'TBPM' (BPM (beats per minute))                     '125.2'
'TCON' (Content type, a.k.a. Genre)                 'prerock-vocal-italian'
'TDRC' (Recording time)                             '1910-03-14'
'TIT2' (Title/songname/content description)         "No Ve L' Avevo Detto (Madama Butterfly)"
'TKEY' (Initial key)                                '12A'
'TLEN' (Length)                                     '226000'
'TPE1' (Lead performer(s)/Soloist(s))               'Enrico Caruso'
'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:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+2.11 dB'
'TXXX:replaygain_track_peak'                        '0.654746'

========================== row from database ==========================
                                              'id'  1512587
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1910/Enrico Caruso - No Ve l_ Avevo Detto (Madama Butterfly) 14-3-1910.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  226
                                           'genre'  prerock-vocal-italian
                                        'filesize'  4572179
                                           'mtime'  1621509274
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1910 l_ 14 3 1910 prerock vocal italian
                                      'tag_artist'  Enrico Caruso
                                     'tag_release'  [non-album tracks]
                                       'tag_title'  No Ve L' Avevo Detto (Madama Butterfly)
                                             'bpm'  125.2
                                    'search_title'  'avevo':5 'butterfly':9,10 'detto':6 'l':3,4 'madama':7,8 'no':1 've':2
                                   'search_artist'  'caruso':2 'enrico':1
                                  'search_release'  'album':2 'non':1 'nonalbum':3 'tracks':4,5
                                     'search_rest'  '00oldiepop':5 '1910':6 '3':8 'country':4 'exotica':2 'italian':11 'jazz':1 'l':7 'oldies':3 'prerock':9 'vocal':10
                                    'search_combo'  '00oldiepop':22 '1910':23 '3':25 'album':14C 'avevo':5A 'butterfly':9A,10A 'caruso':12B 'country':21 'detto':6A 'enrico':11B 'exotica':19 'italian':28 'jazz':18 'l':3A,4A,24 'madama':7A,8A 'no':1A 'non':13C 'nonalbum':15C 'oldies':20 'prerock':26 'tracks':16C,17C 've':2A 'vocal':27
                                    'tag_tracknum'  None
                                      'num_images'  1
                                             'key'  12A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-2', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  []
                                        'tag_date'  1910
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621509274.010135  (2021-05-20 13:14:34)
                             'size'  4572179