======================== unified (from filesystem) ========================
                                         'bitrate'  '96.0'
                                        'duration'  '199'
                                          'artist'  'Fats Waller'
                                     'text_people'  ''
                                         'release'  'The Early Years, Part 1, Disc 1'
                                           'title'  "A Porter's Love Song To A Chambermaid"
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'Q-LOCALNESS-1', 'Q-JZFKS-2', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-1', 'q-play-2', "
 "'q-chart-2', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['piano', 'jazz', 'blues', 'jazz piano', 'swing']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '306'
                                      'tracktotal'  ''
                                            'date'  '1934'
                                        'comments'  ''
                                           'genre'  'prerock-swing'
                                             'bpm'  '139.370'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'COMM:CDDB Disc ID:XXX'                             '5D0F4B16'
'COMM:Comment:XXX'                                  'RCA/Bluebird 66618-2'
'COMM:ID3v1 Comment:XXX'                            '5D0F4B16'
'TALB' (Album/Movie/Show title)                     'The Early Years, Part 1, Disc 1'
'TBPM' (BPM (beats per minute))                     '139.370'
'TCON' (Content type, a.k.a. Genre)                 'prerock-swing'
'TDRC' (Recording time)                             '1934'
'TIT2' (Title/songname/content description)         "A Porter's Love Song To A Chambermaid"
'TKEY' (Initial key)                                '8A'
'TPE1' (Lead performer(s)/Soloist(s))               'Fats Waller'
'TPE2' (Band/orchestra/accompaniment)               'Fats Waller'
'TRCK' (Track number/Position in set)               '306'
'TSSE' (Software/Hardware and settings used for encoding)  'Audiograbber 1.82.02, LAME dll 3.93, 96 Kbit/s, Mono, High quality'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['piano', 'jazz', 'blues', 'jazz piano', 'swing']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+8.65 dB'
'TXXX:replaygain_track_peak'                        '0.419727'

========================== row from database ==========================
                                              'id'  1518897
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1934/128 fats waller - a porter_s love song to a chambermaid.mp3
                                         'working'  None
                                         'bitrate'  96
                                    'duration_sec'  199
                                           'genre'  prerock-swing
                                        'filesize'  2394587
                                           'mtime'  1620560341
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1934 128 fats waller porter_s love song to chambermaid prerock swing
                                      'tag_artist'  Fats Waller
                                     'tag_release'  The Early Years, Part 1, Disc 1
                                       'tag_title'  A Porter's Love Song To A Chambermaid
                                             'bpm'  139.37
                                    'search_title'  'a':1 'chambermaid':8 'love':5 'porter':2 'porters':4 's':3 'song':6 'to':7
                                   'search_artist'  'fats':1 'waller':2
                                  'search_release'  '1':6,7 'disc':8 'early':2 'part':5 'the':1 'years':3,4
                                     'search_rest'  '00oldiepop':5 '128':7 '1934':6 'chambermaid':15 'country':4 'exotica':2 'fats':8 'jazz':1 'love':12 'oldies':3 'porter':10 'prerock':16 's':11 'song':13 'swing':17 'to':14 'waller':9
                                    'search_combo'  '00oldiepop':23 '1':16C,17C '128':25 '1934':24 'a':1A 'chambermaid':8A,33 'country':22 'disc':18C 'early':12C 'exotica':20 'fats':9B,26 'jazz':19 'love':5A,30 'oldies':21 'part':15C 'porter':2A,28 'porters':4A 'prerock':34 's':3A,29 'song':6A,31 'swing':35 'the':11C 'to':7A,32 'waller':10B,27 'years':13C,14C
                                    'tag_tracknum'  306
                                      'num_images'  0
                                             'key'  8A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-2', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['piano', 'jazz', 'blues', 'jazz piano', 'swing']
                                        'tag_date'  1934
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620560341.0774846  (2021-05-09 13:39:01)
                             'size'  2394587