======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '347'
                                          'artist'  'Preservation Hall Jazz Band'
                                     'text_people'  ''
                                         'release'  'Best of Preservation Hall Jazz Band'
                                           'title'  'St. Louis Blues'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-2', 'Q-UNU-1', 'Q-JZFKS-3', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-1', 'q-play-3', "
 "'q-chart-2', 'q-drums-2', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['new orleans', 'jazz', 'jazz or blues', 'dixieland', 'jazz band']"
                                     'discogstags'  "['jazz']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '5'
                                      'tracktotal'  ''
                                            'date'  '1999'
                                        'comments'  ''
                                           'genre'  'prerock-jb-jazz-o-dixiestyle'
                                             'bpm'  '85.489'
                                             'key'  '7B'
                                        'acoustid'  ''
rest: ''

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

'POPM:Windows Media Player 9 Series'                POPM(email='Windows Media Player 9 Series', rating=196, count=0)
'TALB' (Album/Movie/Show title)                     'Best of Preservation Hall Jazz Band'
'TBPM' (BPM (beats per minute))                     '85.489'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-jazz-o-dixiestyle'
'TDRC' (Recording time)                             '1999'
'TIT2' (Title/songname/content description)         'St. Louis Blues'
'TKEY' (Initial key)                                '7B'
'TPE1' (Lead performer(s)/Soloist(s))               'Preservation Hall Jazz Band'
'TPE2' (Band/orchestra/accompaniment)               'Preservation Hall Jazz Band'
'TRCK' (Track number/Position in set)               '5'
'TXXX:FMPS_Rating'                                  '0.8'
'TXXX:MP3GAIN_MINMAX'                               '069,208'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '3'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  'jazz'
'TXXX:lastfmtags'                                   ['new orleans', 'jazz', 'jazz or blues', 'dixieland', 'jazz band']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+2.20 dB'
'TXXX:replaygain_track_peak'                        '0.693531'

========================== row from database ==========================
                                              'id'  672970
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/Preservation Hall/Preservation Hall Jazz Band/Best of Preservation Hall Jazz Band__MBZ;#Preservation Hall Jazz Band;#Best of Preservation Hall Jazz Band;#05;#St. Louis Blues.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  347
                                           'genre'  prerock-jb-jazz-o-dixiestyle
                                        'filesize'  5569793
                                           'mtime'  1620533949
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country Band__MBZ;#Preservation Band;#Best Band;#05;#St. prerock jb jazz dixiestyle
                                      'tag_artist'  Preservation Hall Jazz Band
                                     'tag_release'  Best of Preservation Hall Jazz Band
                                       'tag_title'  St. Louis Blues
                                             'bpm'  85.489
                                    'search_title'  'blues':4 'louis':3 'st':1,2
                                   'search_artist'  'band':4 'hall':2 'jazz':3 'preservation':1
                                  'search_release'  'band':6 'best':1 'hall':4 'jazz':5 'of':2 'preservation':3
                                     'search_rest'  '05':16,19 'band':5,8,11,13,15,18 'best':12,14 'country':4 'dixiestyle':23 'exotica':2 'jazz':1 'jb':22 'mbz':6,9 'oldies':3 'prerock':21 'preservation':7,10 'st':17,20
                                    'search_combo'  '05':30,33 'band':8B,14C,19,22,25,27,29,32 'best':9C,26,28 'blues':4A 'country':18 'dixiestyle':37 'exotica':16 'hall':6B,12C 'jazz':7B,13C,15 'jb':36 'louis':3A 'mbz':20,23 'of':10C 'oldies':17 'prerock':35 'preservation':5B,11C,21,24 'st':1A,2A,31,34
                                    'tag_tracknum'  5
                                      'num_images'  1
                                             'key'  7B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-3', 'q-busy-3', 'q-drums-2', 'q-syn-1', 'q-chart-2', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['new orleans', 'jazz', 'jazz or blues', 'dixieland', 'jazz band']
                                        'tag_date'  1999
                                     'discogstags'  ['jazz']

============================== file details ==============================
                                           'mtime'  1620533949.0623162  (2021-05-09 06:19:09)
                             'size'  5569793