======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '132'
                                          'artist'  'Fred van Eps'
                                     'text_people'  ''
                                         'release'  'Victor 17033 (11387-1)'
                                           'title'  'Red Pepper Rag'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-2', 'Q-LOCALNESS-3', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-1', 'q-play-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['instrumental', 'everything', 'all', 'banjo', 'ragtime']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1911'
                                        'comments'  ''
                                           'genre'  'prerock-banjo'
                                             'bpm'  '102.178'
                                             'key'  '4A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Victor 17033 (11387-1)'
'TBPM' (BPM (beats per minute))                     '102.178'
'TCON' (Content type, a.k.a. Genre)                 'prerock-banjo'
'TDRC' (Recording time)                             '1911'
'TIT2' (Title/songname/content description)         'Red Pepper Rag'
'TKEY' (Initial key)                                '4A'
'TPE1' (Lead performer(s)/Soloist(s))               'Fred van Eps'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['instrumental', 'everything', 'all', 'banjo', 'ragtime']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'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'                                     '1'
'TXXX:replaygain_track_gain'                        '+1.90 dB'
'TXXX:replaygain_track_peak'                        '0.670054'

========================== row from database ==========================
                                              'id'  1435593
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1911/Fred van Eps banjo - Red Pepper Rag 19-12-1911.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  132
                                           'genre'  prerock-banjo
                                        'filesize'  2658098
                                           'mtime'  1620559171
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1911 banjo 19 12 1911 prerock banjo
                                      'tag_artist'  Fred van Eps
                                     'tag_release'  Victor 17033 (11387-1)
                                       'tag_title'  Red Pepper Rag
                                             'bpm'  102.178
                                    'search_title'  'pepper':2 'rag':3 'red':1
                                   'search_artist'  'eps':3 'fred':1 'van':2
                                  'search_release'  '1':4 '11387':3 '113871':5 '17033':2 'victor':1
                                     'search_rest'  '00oldiepop':5 '19':8 '1911':6 'banjo':7 'country':4 'exotica':2 'jazz':1 'oldies':3 'prerock':9
                                    'search_combo'  '00oldiepop':16 '1':10C '11387':9C '113871':11C '17033':8C '19':19 '1911':17 'banjo':18 'country':15 'eps':6B 'exotica':13 'fred':4B 'jazz':12 'oldies':14 'pepper':2A 'prerock':20 'rag':3A 'red':1A 'van':5B 'victor':7C
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  4A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-2', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['instrumental', 'everything', 'all', 'banjo', 'ragtime']
                                        'tag_date'  1911
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620559171.4723659  (2021-05-09 13:19:31)
                             'size'  2658098