======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '172'
                                          'artist'  'Muddy Waters'
                                     'text_people'  ''
                                         'release'  "25 Blues 'n' Soul Greats Vol. 4"
                                           'title'  'FORTY DAYS & FORTY NIGHTS'
                                           'quals'  ("['Q-HAP-2', 'Q-JZFKS-3', 'Q-LOCALNESS-3', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-3', 'q-busy-2', 'q-grit-2', 'q-play-3', "
 "'q-chart-3', 'q-drums-2', 'q-other-3', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['delta blues', 'guitar', 'blues', 'chicago blues', 'classic blues']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '16'
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'prerock-jb-blues'
                                             'bpm'  '88.554'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     "25 Blues 'n' Soul Greats Vol. 4"
'TBPM' (BPM (beats per minute))                     '88.554'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-blues'
'TIT2' (Title/songname/content description)         'FORTY DAYS & FORTY NIGHTS'
'TKEY' (Initial key)                                '8A'
'TPE1' (Lead performer(s)/Soloist(s))               'Muddy Waters'
'TRCK' (Track number/Position in set)               '16'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '3'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['delta blues', 'guitar', 'blues', 'chicago blues', 'classic blues']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+2.60 dB'
'TXXX:replaygain_track_peak'                        '0.416621'

========================== row from database ==========================
                                              'id'  1499129
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/Muddy Waters/MUDDY WATERS__16_MUDDY WATERS_FORTY DAYS & FORTY NIGHTS_25 BLUES _N_ SOUL GREATS VOL. 4.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  172
                                           'genre'  prerock-jb-blues
                                        'filesize'  2769646
                                           'mtime'  1620402449
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country MUDDY WATERS__16_MUDDY WATERS_FORTY NIGHTS_25 BLUES _N_ SOUL GREATS VOL. prerock jb blues
                                      'tag_artist'  Muddy Waters
                                     'tag_release'  25 Blues 'n' Soul Greats Vol. 4
                                       'tag_title'  FORTY DAYS & FORTY NIGHTS
                                             'bpm'  88.554
                                    'search_title'  'days':2 'forty':1 'nights':3
                                   'search_artist'  'muddy':1 'waters':2
                                  'search_release'  '25':1 '4':9 'blues':2 'greats':6 'n':3,4 'soul':5 'vol':7,8
                                     'search_rest'  '16':7 '25':12 'blues':13 'country':4 'exotica':2 'forty':10 'greats':16 'jazz':1 'jb':20 'muddy':5,8 'n':14 'nights':11 'oldies':3 'prerock':19 'soul':15 'vol':17,18 'waters':6,9
                                    'search_combo'  '16':21 '25':6C,26 '4':14C 'blues':7C,27 'country':18 'days':2A 'exotica':16 'forty':1A,24 'greats':11C,30 'jazz':15 'jb':34 'muddy':4B,19,22 'n':8C,9C,28 'nights':3A,25 'oldies':17 'prerock':33 'soul':10C,29 'vol':12C,13C,31,32 'waters':5B,20,23
                                    'tag_tracknum'  16
                                      'num_images'  0
                                             'key'  8A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-3', 'q-busy-2', 'q-drums-2', 'q-syn-1', 'q-chart-3', 'q-other-3', 'Q-HAP-2', 'q-bass-3', 'q-grit-2']
                                      'lastfmtags'  ['delta blues', 'guitar', 'blues', 'chicago blues', 'classic blues']
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620402449.1307871  (2021-05-07 17:47:29)
                             'size'  2769646