======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '178'
                                          'artist'  'Ragtime Blues Guitar'
                                     'text_people'  ''
                                         'release'  'Complete Recorded Works'
                                           'title'  'barbershop rag-william moore'
                                           'quals'  ("['Q-HAP-2', 'Q-LOCALNESS-2', 'Q-JZFKS-3', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-2', 'q-play-3', "
 "'q-chart-1', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '7'
                                      'tracktotal'  ''
                                            'date'  '1929'
                                        'comments'  ''
                                           'genre'  'prerock-jb-blues'
                                             'bpm'  '119.405'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'COMM:ID3v1 Comment:XXX'                            '0'
'COMM:iTunNORM:eng'                                 (' 00000133 00000135 00001C0E 00001C15 0001689C 0001689C 00005349 0000548D '
 '0002027D 0002027D')
'COMM:iTunPGAP:eng'                                 '0'
'COMM:iTunSMPB:eng'                                 (' 00000000 00000210 00000774 0000000000780E7C 00000000 002B853A 00000000 '
 '00000000 00000000 00000000 00000000 00000000')
'TALB' (Album/Movie/Show title)                     'Complete Recorded Works'
'TBPM' (BPM (beats per minute))                     '119.405'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-blues'
'TDRC' (Recording time)                             '1929'
'TENC' (Encoded by)                                 'iTunes v7.0.2.16'
'TIT2' (Title/songname/content description)         'barbershop rag-william moore'
'TKEY' (Initial key)                                '8A'
'TPE1' (Lead performer(s)/Soloist(s))               'Ragtime Blues Guitar'
'TRCK' (Track number/Position in set)               '7'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '3'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+1.95 dB'
'TXXX:replaygain_track_peak'                        '0.665178'

========================== row from database ==========================
                                              'id'  673735
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/Ragtime Blues Guitar (1927-1930)/07 barbershop rag-william moore.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  178
                                           'genre'  prerock-jb-blues
                                        'filesize'  2985984
                                           'mtime'  1620402499
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country (1927 1930) 07 prerock jb blues
                                      'tag_artist'  Ragtime Blues Guitar
                                     'tag_release'  Complete Recorded Works
                                       'tag_title'  barbershop rag-william moore
                                             'bpm'  119.405
                                    'search_title'  'barbershop':1 'moore':5 'rag':2 'ragwilliam':4 'william':3
                                   'search_artist'  'blues':2 'guitar':3 'ragtime':1
                                  'search_release'  'complete':1 'recorded':2 'works':3
                                     'search_rest'  '1927':5,6 '1930':7,8 'blues':11 'country':4 'exotica':2 'jazz':1 'jb':10 'oldies':3 'prerock':9
                                    'search_combo'  '1927':16,17 '1930':18,19 'barbershop':1A 'blues':7B,22 'complete':9C 'country':15 'exotica':13 'guitar':8B 'jazz':12 'jb':21 'moore':5A 'oldies':14 'prerock':20 'rag':2A 'ragtime':6B 'ragwilliam':4A 'recorded':10C 'william':3A 'works':11C
                                    'tag_tracknum'  7
                                      'num_images'  1
                                             'key'  8A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-3', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-4', 'Q-HAP-2', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  []
                                        'tag_date'  1929
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620402498.5097494  (2021-05-07 17:48:18)
                             'size'  2985984