======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '165'
                                          'artist'  'Scott Joplin'
                                     'text_people'  ''
                                         'release'  'piano roll'
                                           'title'  'Ole Miss Rag (W C  Handy)'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-JZFKS-2', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'Q-PLAY-2', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-2', 'q-vocals-1', 'q-mixbeat-1', "
 "'Q-PIANO-4']")
                                      'lastfmtags'  "['classical', 'jazz', 'instrumental', 'ragtime', 'piano']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1917'
                                        'comments'  ''
                                           'genre'  'prerock-ragtime'
                                             'bpm'  '102.1'
                                             'key'  '7B'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'COMM:MusicMatch_Bio:eng'                           'Sound edited by Breda4@hotmail.com'
'COMM:MusicMatch_Tempo:eng'                         'None'
'TALB' (Album/Movie/Show title)                     'piano roll'
'TBPM' (BPM (beats per minute))                     '102.1'
'TCON' (Content type, a.k.a. Genre)                 'prerock-ragtime'
'TDRC' (Recording time)                             '1917'
'TIT2' (Title/songname/content description)         'Ole Miss Rag (W C  Handy)'
'TKEY' (Initial key)                                '7B'
'TLEN' (Length)                                     '165000'
'TPE1' (Lead performer(s)/Soloist(s))               'Scott Joplin'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '4'
'TXXX:Q-PLAY'                                       '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['classical', 'jazz', 'instrumental', 'ragtime', 'piano']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+0.71 dB'
'TXXX:replaygain_track_peak'                        '0.795931'

========================== row from database ==========================
                                              'id'  1474684
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1917/Scott Joplin piano roll - Ole Miss Rag (W C Handy) 1917.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  165
                                           'genre'  prerock-ragtime
                                        'filesize'  3385219
                                           'mtime'  1620573901
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1917 1917 prerock ragtime
                                      'tag_artist'  Scott Joplin
                                     'tag_release'  piano roll
                                       'tag_title'  Ole Miss Rag (W C  Handy)
                                             'bpm'  102.1
                                    'search_title'  'c':6 'handy':7,8 'miss':2 'ole':1 'rag':3 'w':4,5
                                   'search_artist'  'joplin':2 'scott':1
                                  'search_release'  'piano':1 'roll':2
                                     'search_rest'  '00oldiepop':5 '1917':6 'country':4 'exotica':2 'jazz':1 'oldies':3 'prerock':7 'ragtime':8
                                    'search_combo'  '00oldiepop':17 '1917':18 'c':6A 'country':16 'exotica':14 'handy':7A,8A 'jazz':13 'joplin':10B 'miss':2A 'oldies':15 'ole':1A 'piano':11C 'prerock':19 'rag':3A 'ragtime':20 'roll':12C 'scott':9B 'w':4A,5A
                                    'tag_tracknum'  None
                                      'num_images'  1
                                             'key'  7B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-mixbeat-1', 'Q-PIANO-4', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-2', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-2', 'Q-HAP-3', 'Q-PLAY-2', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['classical', 'jazz', 'instrumental', 'ragtime', 'piano']
                                        'tag_date'  1917
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620573900.552198  (2021-05-09 17:25:00)
                             'size'  3385219