======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '198'
                                          'artist'  'Enrico Caruso'
                                     'text_people'  ''
                                         'release'  '[non-album tracks]'
                                           'title'  "Una Furtiva Lagrima (Donizetti - Elisir D' Amore)"
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-1', "
 "'q-play-2', 'Q-JZFKS-1', 'Q-OLDST-1', 'q-chart-2', 'q-drums-1', 'q-other-2', "
 "'q-piano-1', 'q-vocals-4', 'Q-HHRNBTT-1', 'q-mixbeat-1', 'Q-LOCALNESS-1']")
                                      'lastfmtags'  "['opera', 'classical', 'tenor', 'italian', '10s']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1904'
                                        'comments'  ''
                                           'genre'  'prerock-vocal-italian'
                                             'bpm'  '130.2'
                                             'key'  '4A'
                                        '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))                     '130.2'
'TCON' (Content type, a.k.a. Genre)                 'prerock-vocal-italian'
'TDRC' (Recording time)                             '1904-02-01'
'TIT2' (Title/songname/content description)         "Una Furtiva Lagrima (Donizetti - Elisir D' Amore)"
'TKEY' (Initial key)                                '4A'
'TLEN' (Length)                                     '198000'
'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:lastfmtags'                                   ['opera', 'classical', 'tenor', 'italian', '10s']
'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'                        '+1.39 dB'
'TXXX:replaygain_track_peak'                        '0.548493'

========================== row from database ==========================
                                              'id'  1506656
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1904/Enrico Caruso - Una Furtiva Lagrima (L_ Elisir d_ Amore) 1-2-1904.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  198
                                           'genre'  prerock-vocal-italian
                                        'filesize'  4012231
                                           'mtime'  1621509264
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1904 (L_ d_ 1 2 1904 prerock vocal italian
                                      'tag_artist'  Enrico Caruso
                                     'tag_release'  [non-album tracks]
                                       'tag_title'  Una Furtiva Lagrima (Donizetti - Elisir D' Amore)
                                             'bpm'  130.2
                                    'search_title'  'amore':9,10 'd':7,8 'donizetti':4,5 'elisir':6 'furtiva':2 'lagrima':3 'una':1
                                   'search_artist'  'caruso':2 'enrico':1
                                  'search_release'  'album':2 'non':1 'nonalbum':3 'tracks':4,5
                                     'search_rest'  '00oldiepop':5 '1':10 '1904':6 '2':11 'country':4 'd':9 'exotica':2 'italian':14 'jazz':1 'l':7,8 'oldies':3 'prerock':12 'vocal':13
                                    'search_combo'  '00oldiepop':22 '1':27 '1904':23 '2':28 'album':14C 'amore':9A,10A 'caruso':12B 'country':21 'd':7A,8A,26 'donizetti':4A,5A 'elisir':6A 'enrico':11B 'exotica':19 'furtiva':2A 'italian':31 'jazz':18 'l':24,25 'lagrima':3A 'non':13C 'nonalbum':15C 'oldies':20 'prerock':29 'tracks':16C,17C 'una':1A 'vocal':30
                                    'tag_tracknum'  None
                                      'num_images'  1
                                             'key'  4A
                                           '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'  ['opera', 'classical', 'tenor', 'italian', '10s']
                                        'tag_date'  1904
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621509264.1622863  (2021-05-20 13:14:24)
                             'size'  4012231