======================== unified (from filesystem) ========================
                                         'bitrate'  '173.713'
                                        'duration'  '174'
                                          'artist'  'James Brown'
                                     'text_people'  ''
                                         'release'  'The Singles - Volume 2'
                                           'title'  'Mashed Potatoes U.S.A.'
                                           'quals'  ("['Q-LOCALNESS-1', 'Q-OLDST-3', 'Q-HHRNBTT-2', 'Q-JZFKS-3', 'Q-UNU-1', "
 "'q-syn-2', 'q-bass-3', 'q-busy-3', 'q-grit-2', 'q-play-2', 'q-chart-1', "
 "'q-drums-3', 'q-other-2', 'q-piano-1', 'q-vocals-3', 'q-mixbeat-2']")
                                      'lastfmtags'  "['rnb', 'blues', 'rhythm and blues', 'soul', 'funk']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '03'
                                      'tracktotal'  '20'
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'set-pl-spelling'
                                             'bpm'  '111.886'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'The Singles - Volume 2'
'TBPM' (BPM (beats per minute))                     '111.886'
'TCON' (Content type, a.k.a. Genre)                 'set-pl-spelling'
'TIT2' (Title/songname/content description)         'Mashed Potatoes U.S.A.'
'TKEY' (Initial key)                                '6A'
'TLEN' (Length)                                     '174000'
'TPE1' (Lead performer(s)/Soloist(s))               'James Brown'
'TPOS' (Part of a set)                              '2'
'TRCK' (Track number/Position in set)               '03/20'
'TXXX:Q-HHRNBTT'                                    '2'
'TXXX:Q-JZFKS'                                      '3'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['rnb', 'blues', 'rhythm and blues', 'soul', 'funk']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+0.47 dB'
'TXXX:replaygain_track_peak'                        '0.331995'

========================== row from database ==========================
                                              'id'  769591
                                            'path'  /data/Music/Bulk/0playlists/0novelty themes/spelling/James Brown - Mashed Potatoes U.S.A.mp3
                                         'working'  None
                                         'bitrate'  173
                                    'duration_sec'  174
                                           'genre'  set-pl-spelling
                                        'filesize'  3782662
                                           'mtime'  1620356344
                                   'redo_metaread'  0
                                        'rest_str'   0playlists 0novelty themes spelling set pl spelling
                                      'tag_artist'  James Brown
                                     'tag_release'  The Singles - Volume 2
                                       'tag_title'  Mashed Potatoes U.S.A.
                                             'bpm'  111.886
                                    'search_title'  'a':5 'mashed':1 'potatoes':2 's':4 'u':3 'usa':6
                                   'search_artist'  'brown':2 'james':1
                                  'search_release'  '2':4 'singles':2 'the':1 'volume':3
                                     'search_rest'  '0novelty':2 '0playlists':1 'pl':6 'set':5 'spelling':4 'themes':3
                                    'search_combo'  '0novelty':14 '0playlists':13 '2':12C 'a':5A 'brown':8B 'james':7B 'mashed':1A 'pl':18 'potatoes':2A 's':4A 'set':17 'singles':10C 'spelling':16 'the':9C 'themes':15 'u':3A 'usa':6A 'volume':11C
                                    'tag_tracknum'  3
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-2', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-2', 'q-play-2', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-3', 'q-busy-3', 'q-drums-3', 'q-syn-2', 'q-chart-1', 'q-other-2', 'q-bass-3', 'q-grit-2']
                                      'lastfmtags'  ['rnb', 'blues', 'rhythm and blues', 'soul', 'funk']
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620356344.314862  (2021-05-07 04:59:04)
                             'size'  3782662