======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '136'
                                          'artist'  'The Beatles'
                                     'text_people'  ''
                                         'release'  'Billboard Top Pop Singles of 1968'
                                           'title'  'Lady Madonna (Apple)'
                                           'quals'  ("['Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', 'Q-OLDST-2', "
 "'q-syn-2', 'q-bass-4', 'q-busy-3', 'q-grit-2', 'q-play-3', 'q-chart-4', "
 "'q-drums-2', 'q-other-3', 'q-piano-1', 'q-vocals-3', 'q-mixbeat-2']")
                                      'lastfmtags'  "['pop', 'rock', '60s', 'british', 'classic rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '60'
                                      'tracktotal'  ''
                                            'date'  '1968'
                                        'comments'  ''
                                           'genre'  'rock-cppex;set-pl-billboard'
                                             'bpm'  '109.055'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'COMM:ID3v1 Comment:XXX'                            'Billboard'
'TALB' (Album/Movie/Show title)                     'Billboard Top Pop Singles of 1968'
'TBPM' (BPM (beats per minute))                     '109.055'
'TCON' (Content type, a.k.a. Genre)                 ['rock-cppex', 'set-pl-billboard']
'TDRC' (Recording time)                             '1968'
'TIT2' (Title/songname/content description)         'Lady Madonna (Apple)'
'TKEY' (Initial key)                                '8A'
'TPE1' (Lead performer(s)/Soloist(s))               'The Beatles'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TRCK' (Track number/Position in set)               '60'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['pop', 'rock', '60s', 'british', 'classic rock']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+0.10 dB'
'TXXX:replaygain_track_peak'                        '0.499825'

========================== row from database ==========================
                                              'id'  1311785
                                            'path'  /data/Music/Bulk/00poprockelectronic/Billboard/Billboard Top100/1968/060 - Beatles - Lady Madonna (Apple).mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  136
                                           'genre'  rock-cppex;set-pl-billboard
                                        'filesize'  3286651
                                           'mtime'  1620737058
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic Top100 060 rock cppex;set billboard
                                      'tag_artist'  The Beatles
                                     'tag_release'  Billboard Top Pop Singles of 1968
                                       'tag_title'  Lady Madonna (Apple)
                                             'bpm'  109.055
                                    'search_title'  'apple':3,4 'lady':1 'madonna':2
                                   'search_artist'  'beatles':2 'the':1
                                  'search_release'  '1968':6 'billboard':1 'of':5 'pop':3 'singles':4 'top':2
                                     'search_rest'  '00poprockelectronic':1 'billboard':8 'cppex':4,6 'rock':3 'set':5,7 'top100':2
                                    'search_combo'  '00poprockelectronic':13 '1968':12C 'apple':3A,4A 'beatles':6B 'billboard':7C,20 'cppex':16,18 'lady':1A 'madonna':2A 'of':11C 'pop':9C 'rock':15 'set':17,19 'singles':10C 'the':5B 'top':8C 'top100':14
                                    'tag_tracknum'  60
                                      'num_images'  0
                                             'key'  8A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-2', 'q-play-3', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-2', 'q-syn-2', 'q-chart-4', 'q-other-3', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['pop', 'rock', '60s', 'british', 'classic rock']
                                        'tag_date'  1968
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620737058.3750482  (2021-05-11 14:44:18)
                             'size'  3286651