======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '284'
                                          'artist'  'Big Joe Williams'
                                     'text_people'  ''
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                                           'title'  'King Biscuit Stomp #2'
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                                      'lastfmtags'  "['guitar', 'old blues', 'blues', 'delta blues', 'blues guitar']"
                                     'discogstags'  "['blues']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '9'
                                      'tracktotal'  '13'
                                            'date'  '1995'
                                        'comments'  ''
                                           'genre'  'prerock-jb-blues'
                                             'bpm'  '120.042'
                                             'key'  '11B'
                                        'acoustid'  '323cb282-5015-44c1-a512-83d1944f9aaf'
rest: ''

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

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'TBPM' (BPM (beats per minute))                     '120.042'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-blues'
'TDOR' (Original release time)                      '1995'
'TDRC' (Recording time)                             '1995'
'TIT2' (Title/songname/content description)         'King Biscuit Stomp #2'
'TKEY' (Initial key)                                '11B'
'TMED' (Media type)                                 'HDCD'
'TPE1' (Lead performer(s)/Soloist(s))               'Big Joe Williams'
'TPE2' (Band/orchestra/accompaniment)               'Big Joe Williams'
'TPOS' (Part of a set)                              '1/1'
'TPUB' (Publisher)                                  'Smithsonian Folkways'
'TRCK' (Track number/Position in set)               '9/13'
'TSO2'                                              'Williams, Big Joe'
'TSOP' (Performer sort order)                       'Williams, Big Joe'
'TXXX:ASIN'                                         'B000001DIN'
'TXXX:Acoustid Id'                                  '323cb282-5015-44c1-a512-83d1944f9aaf'
'TXXX:Artists'                                      'Big Joe Williams'
'TXXX:BARCODE'                                      '093074005224'
'TXXX:CATALOGNUMBER'                                'SF CD 40052'
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'TXXX:MusicBrainz Album Id'                         '3363349c-1d98-4a3d-a8e2-3ca26b2b47f8'
'TXXX:MusicBrainz Album Release Country'            'US'
'TXXX:MusicBrainz Album Status'                     'official'
'TXXX:MusicBrainz Album Type'                       'album'
'TXXX:MusicBrainz Artist Id'                        'bf295ac0-21e8-4e11-89e9-22b10fd8973a'
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'TXXX:Q-JZFKS'                                      '3'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:SCRIPT'                                       'Latn'
'TXXX:discogstags'                                  'blues'
'TXXX:lastfmtags'                                   ['guitar', 'old blues', 'blues', 'delta blues', 'blues guitar']
'TXXX:originalyear'                                 '1995'
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'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'                        '+2.84 dB'
'TXXX:replaygain_track_peak'                        '0.408608'
'UFID:http://musicbrainz.org'                       UFID(owner='http://musicbrainz.org', data=b'f0bdcb52-7d4b-489f-a972-5aa4eb4ccac4')

========================== row from database ==========================
                                              'id'  673474
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/Big Joe Williams/09 King Bisquit Stomp #2.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  284
                                           'genre'  prerock-jb-blues
                                        'filesize'  6894900
                                           'mtime'  1620402222
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 09 Bisquit prerock jb blues
                                      'tag_artist'  Big Joe Williams
                                     'tag_release'  Mississippi's Big Joe Williams and His Nine-String Guitar
                                       'tag_title'  King Biscuit Stomp #2
                                             'bpm'  120.042
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                                   'search_artist'  'big':1 'joe':2 'williams':3
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                                     'search_rest'  'bisquit':5 'blues':8 'country':4 'exotica':2 'jazz':1 'jb':7 'oldies':3 'prerock':6
                                    'search_combo'  '2':4A,5A 'and':15C 'big':6B,12C 'biscuit':2A 'bisquit':25 'blues':28 'country':24 'exotica':22 'guitar':20C 'his':16C 'jazz':21 'jb':27 'joe':7B,13C 'king':1A 'mississippi':9C 'mississippis':11C 'nine':17C 'ninestring':19C 'oldies':23 'prerock':26 's':10C 'stomp':3A 'string':18C 'williams':8B,14C
                                    'tag_tracknum'  9
                                      'num_images'  1
                                             'key'  11B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-3', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-3', 'Q-HAP-2', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['guitar', 'old blues', 'blues', 'delta blues', 'blues guitar']
                                        'tag_date'  1995
                                     'discogstags'  ['blues']

============================== file details ==============================
                                           'mtime'  1620402221.972376  (2021-05-07 17:43:41)
                             'size'  6894900