======================== unified (from filesystem) ========================
                                         'bitrate'  '192.015'
                                        'duration'  '166'
                                          'artist'  'Howling Wolf'
                                     'text_people'  ''
                                         'release'  'Sings the Blues'
                                           'title'  'Chocolate Drop (alt. version)'
                                           'quals'  ("['Q-OLDST-2', 'Q-JZFKS-3', 'Q-LOCALNESS-1', 'Q-UNU-1', 'q-syn-1', "
 "'q-bass-3', 'q-busy-3', 'q-grit-2', 'q-play-2', 'q-chart-2', 'q-drums-2', "
 "'q-other-3', 'q-piano-1', 'q-vocals-3', 'Q-HHRNBTT-1', 'q-mixbeat-1']")
                                      'lastfmtags'  "['blues', 'chicago blues', 'classic blues', 'delta blues', 'rhythm and blues']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '16'
                                      'tracktotal'  '20'
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'set-th-candy'
                                             'bpm'  '113.389'
                                             'key'  '10A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Sings the Blues'
'TBPM' (BPM (beats per minute))                     '113.389'
'TCON' (Content type, a.k.a. Genre)                 'set-th-candy'
'TENC' (Encoded by)                                 'Amadeus II'
'TIT2' (Title/songname/content description)         'Chocolate Drop (alt. version)'
'TKEY' (Initial key)                                '10A'
'TPE1' (Lead performer(s)/Soloist(s))               'Howling Wolf'
'TRCK' (Track number/Position in set)               '16/20'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '3'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['blues', 'chicago blues', 'classic blues', 'delta blues', 'rhythm and blues']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+2.83 dB'
'TXXX:replaygain_track_peak'                        '0.285745'

========================== row from database ==========================
                                              'id'  1508743
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/sweets/Howlin_ Wolf - Chocolate Drop (alt. version).mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  166
                                           'genre'  set-th-candy
                                        'filesize'  4001596
                                           'mtime'  1620343115
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country sweets Howlin_ set candy
                                      'tag_artist'  Howling Wolf
                                     'tag_release'  Sings the Blues
                                       'tag_title'  Chocolate Drop (alt. version)
                                             'bpm'  113.389
                                    'search_title'  'alt':3,4 'chocolate':1 'drop':2 'version':5,6
                                   'search_artist'  'howling':1 'wolf':2
                                  'search_release'  'blues':3 'sings':1 'the':2
                                     'search_rest'  'candy':8 'country':4 'exotica':2 'howlin':6 'jazz':1 'oldies':3 'set':7 'sweets':5
                                    'search_combo'  'alt':3A,4A 'blues':11C 'candy':19 'chocolate':1A 'country':15 'drop':2A 'exotica':13 'howlin':17 'howling':7B 'jazz':12 'oldies':14 'set':18 'sings':9C 'sweets':16 'the':10C 'version':5A,6A 'wolf':8B
                                    'tag_tracknum'  16
                                      'num_images'  0
                                             'key'  10A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-3', 'q-busy-3', 'q-drums-2', 'q-syn-1', 'q-chart-2', 'q-other-3', 'q-bass-3', 'q-grit-2']
                                      'lastfmtags'  ['blues', 'chicago blues', 'classic blues', 'delta blues', 'rhythm and blues']
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620343115.4360042  (2021-05-07 01:18:35)
                             'size'  4001596