======================== unified (from filesystem) ========================
                                         'bitrate'  '168.016'
                                        'duration'  '149'
                                          'artist'  'B.B. King'
                                     'text_people'  ''
                                         'release'  "25 Blues 'n' Soul Greats - volume 1"
                                           'title'  'Catfish Blues'
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'Q-JZFKS-1', 'Q-LOCALNESS-2', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-2', 'q-play-3', "
 "'q-chart-3', 'q-drums-4', 'q-other-1', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['guitar', 'blues rock', 'blues', 'jazz', 'classic rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '08'
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'prerock-jb-unsorted'
                                             'bpm'  '96.853'
                                             'key'  '12B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     "25 Blues 'n' Soul Greats - volume 1"
'TBPM' (BPM (beats per minute))                     '96.853'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-unsorted'
'TIT2' (Title/songname/content description)         'Catfish Blues'
'TKEY' (Initial key)                                '12B'
'TPE1' (Lead performer(s)/Soloist(s))               'B.B. King'
'TRCK' (Track number/Position in set)               '08'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['guitar', 'blues rock', 'blues', 'jazz', 'classic rock']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '4'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '1'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+1.46 dB'
'TXXX:replaygain_track_peak'                        '0.425826'

========================== row from database ==========================
                                              'id'  1521962
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/B. B. King/MBZ;#B.B. King;#25 Blues _n_ Soul Greats - volume 1;#08;#Catfish Blues.mp3
                                         'working'  None
                                         'bitrate'  168
                                    'duration_sec'  149
                                           'genre'  prerock-jb-unsorted
                                        'filesize'  3133887
                                           'mtime'  1620528185
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country MBZ;#B.B. King;#25 _n_ 1;#08;#Catfish prerock jb unsorted
                                      'tag_artist'  B.B. King
                                     'tag_release'  25 Blues 'n' Soul Greats - volume 1
                                       'tag_title'  Catfish Blues
                                             'bpm'  96.853
                                    'search_title'  'blues':2 'catfish':1
                                   'search_artist'  'b':1,2 'bb':3 'king':4
                                  'search_release'  '1':8 '25':1 'blues':2 'greats':6 'n':3,4 'soul':5 'volume':7
                                     'search_rest'  '08':16,19 '1':15,18 '25':11,13 'b':6,7 'bb':9 'catfish':17,20 'country':4 'exotica':2 'jazz':1 'jb':22 'king':10,12 'mbz':5,8 'n':14 'oldies':3 'prerock':21 'unsorted':23
                                    'search_combo'  '08':30,33 '1':14C,29,32 '25':7C,25,27 'b':3B,4B,20,21 'bb':5B,23 'blues':2A,8C 'catfish':1A,31,34 'country':18 'exotica':16 'greats':12C 'jazz':15 'jb':36 'king':6B,24,26 'mbz':19,22 'n':9C,10C,28 'oldies':17 'prerock':35 'soul':11C 'unsorted':37 'volume':13C
                                    'tag_tracknum'  8
                                      'num_images'  0
                                             'key'  12B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-4', 'q-syn-1', 'q-chart-3', 'q-other-1', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['guitar', 'blues rock', 'blues', 'jazz', 'classic rock']
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620528184.6587884  (2021-05-09 04:43:04)
                             'size'  3133887