======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '194'
                                          'artist'  'Alessandro Moreschi'
                                     'text_people'  ''
                                         'release'  '[non-album tracks]'
                                           'title'  'Preghiera (tosti)'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-LOCALNESS-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-1', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['opera', 'male vocalists', 'castrato', 'classical']"
                                     'discogstags'  "['classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1904'
                                        'comments'  ''
                                           'genre'  'prerock-vocal'
                                             'bpm'  '128.3'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'TALB' (Album/Movie/Show title)                     '[non-album tracks]'
'TBPM' (BPM (beats per minute))                     '128.3'
'TCON' (Content type, a.k.a. Genre)                 'prerock-vocal'
'TDRC' (Recording time)                             '1904'
'TIT2' (Title/songname/content description)         'Preghiera (tosti)'
'TKEY' (Initial key)                                '6A'
'TLEN' (Length)                                     '194000'
'TPE1' (Lead performer(s)/Soloist(s))               'Alessandro Moreschi'
'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'
'TXXX:lastfmtags'                                   ['opera', 'male vocalists', 'castrato', 'classical']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+1.84 dB'
'TXXX:replaygain_track_peak'                        '0.581033'

========================== row from database ==========================
                                              'id'  1463178
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1904/Alessandro Moreschi - Preghiera (Tosti) 1904.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  194
                                           'genre'  prerock-vocal
                                        'filesize'  3961313
                                           'mtime'  1620665847
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1904 (Tosti) 1904 prerock vocal
                                      'tag_artist'  Alessandro Moreschi
                                     'tag_release'  [non-album tracks]
                                       'tag_title'  Preghiera (tosti)
                                             'bpm'  128.3
                                    'search_title'  'preghiera':1 'tosti':2,3
                                   'search_artist'  'alessandro':1 'moreschi':2
                                  'search_release'  'album':2 'non':1 'nonalbum':3 'tracks':4,5
                                     'search_rest'  '00oldiepop':5 '1904':6 'country':4 'exotica':2 'jazz':1 'oldies':3 'prerock':9 'tosti':7,8 'vocal':10
                                    'search_combo'  '00oldiepop':15 '1904':16 'album':7C 'alessandro':4B 'country':14 'exotica':12 'jazz':11 'moreschi':5B 'non':6C 'nonalbum':8C 'oldies':13 'preghiera':1A 'prerock':19 'tosti':2A,3A,17,18 'tracks':9C,10C 'vocal':20
                                    'tag_tracknum'  None
                                      'num_images'  1
                                             'key'  6A
                                           '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-1', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['opera', 'male vocalists', 'castrato', 'classical']
                                        'tag_date'  1904
                                     'discogstags'  ['classical']

============================== file details ==============================
                                           'mtime'  1620665847.1621206  (2021-05-10 18:57:27)
                             'size'  3961313