======================== unified (from filesystem) ========================
                                         'bitrate'  '203.804'
                                        'duration'  '326'
                                          'artist'  'Muddy Waters'
                                     'text_people'  ''
                                         'release'  'The Blues'
                                           'title'  'Black Snake Moan'
                                           'quals'  ("['Q-HAP-2', 'Q-JZFKS-3', 'Q-LOCALNESS-3', 'Q-HHRNBTT-1', 'Q-UNU-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-2', 'q-busy-2', 'q-grit-2', 'q-play-3', "
 "'q-chart-2', 'q-drums-4', 'q-other-3', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['delta blues', 'guitar', 'blues', 'chicago blues', 'classic blues']"
                                     'discogstags'  "['delta blues', 'blues']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '1'
                                      'tracktotal'  ''
                                            'date'  '1960'
                                        'comments'  ''
                                           'genre'  'prerock-jb-blues'
                                             'bpm'  '143.925'
                                             'key'  '11B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'The Blues'
'TBPM' (BPM (beats per minute))                     '143.925'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-blues'
'TDRC' (Recording time)                             '1960'
'TIT2' (Title/songname/content description)         'Black Snake Moan'
'TKEY' (Initial key)                                '11B'
'TPE1' (Lead performer(s)/Soloist(s))               'Muddy Waters'
'TRCK' (Track number/Position in set)               '1'
'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:discogstags'                                  ['delta blues', 'blues']
'TXXX:lastfmtags'                                   ['delta blues', 'guitar', 'blues', 'chicago blues', 'classic blues']
'TXXX:q-bass'                                       '2'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '4'
'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'                        '+0.54 dB'
'TXXX:replaygain_track_peak'                        '0.716065'

========================== row from database ==========================
                                              'id'  1361688
                                            'path'  /data/Music/Bulk/00poprockelectronic/The Blues/01 Black Snake Moan.wma.mp3
                                         'working'  None
                                         'bitrate'  203
                                    'duration_sec'  326
                                           'genre'  prerock-jb-blues
                                        'filesize'  8308295
                                           'mtime'  1620403794
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic 01 Moan.wma prerock jb blues
                                      'tag_artist'  Muddy Waters
                                     'tag_release'  The Blues
                                       'tag_title'  Black Snake Moan
                                             'bpm'  143.925
                                    'search_title'  'black':1 'moan':3 'snake':2
                                   'search_artist'  'muddy':1 'waters':2
                                  'search_release'  'blues':2 'the':1
                                     'search_rest'  '00poprockelectronic':1 'blues':7 'jb':6 'moan':2 'moanwma':4 'prerock':5 'wma':3
                                    'search_combo'  '00poprockelectronic':8 'black':1A 'blues':7C,14 'jb':13 'moan':3A,9 'moanwma':11 'muddy':4B 'prerock':12 'snake':2A 'the':6C 'waters':5B 'wma':10
                                    'tag_tracknum'  1
                                      'num_images'  0
                                             'key'  11B
                                           '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-4', 'q-syn-1', 'q-chart-2', 'q-other-3', 'Q-HAP-2', 'q-bass-2', 'q-grit-2']
                                      'lastfmtags'  ['delta blues', 'guitar', 'blues', 'chicago blues', 'classic blues']
                                        'tag_date'  1960
                                     'discogstags'  ['delta blues', 'blues']

============================== file details ==============================
                                           'mtime'  1620403794.092022  (2021-05-07 18:09:54)
                             'size'  8308295