======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '152'
                                          'artist'  'Fletcher Henderson with Georgia Boy Simpkins'
                                     'text_people'  ''
                                         'release'  '20s and 30s popular'
                                           'title'  'SING SING SING.'
                                           'quals'  ("['Q-LOCALNESS-1', 'Q-JZFKS-2', 'Q-UNU-1', 'Q-HHRNBTT-1', 'Q-OLDST-1', "
 "'q-syn-1', 'q-bass-3', 'q-busy-2', 'q-grit-1', 'q-play-2', 'q-chart-2', "
 "'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-2', 'q-mixbeat-1']")
                                      'lastfmtags'  "['jazz', 'swing', 'big band', 'ragtime', '20s']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1935'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '107.435'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'TALB' (Album/Movie/Show title)                     '20s and 30s popular'
'TBPM' (BPM (beats per minute))                     '107.435'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1935'
'TIT2' (Title/songname/content description)         'SING SING SING.'
'TKEY' (Initial key)                                '8A'
'TLEN' (Length)                                     '152413'
'TPE1' (Lead performer(s)/Soloist(s))               'Fletcher Henderson with Georgia Boy Simpkins'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['jazz', 'swing', 'big band', 'ragtime', '20s']
'TXXX:q-bass'                                       '3'
'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'                                     '2'
'TXXX:replaygain_track_gain'                        '+1.68 dB'
'TXXX:replaygain_track_peak'                        '0.516765'

========================== row from database ==========================
                                              'id'  1146970
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1920s and 1930s popular/Fletcher Henderson & His Orchestra - SING SING SING.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  152
                                           'genre'  prerock-unsorted
                                        'filesize'  2525184
                                           'mtime'  1620385357
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1920s 1930s & His Orchestra prerock unsorted
                                      'tag_artist'  Fletcher Henderson with Georgia Boy Simpkins
                                     'tag_release'  20s and 30s popular
                                       'tag_title'  SING SING SING.
                                             'bpm'  107.435
                                    'search_title'  'sing':1,2
                                   'search_artist'  'boy':5 'fletcher':1 'georgia':4 'henderson':2 'simpkins':6 'with':3
                                  'search_release'  '20s':1 '30s':3 'and':2 'popular':4
                                     'search_rest'  '00oldiepop':5 '1920s':6 '1930s':7 'country':4 'exotica':2 'his':8 'jazz':1 'oldies':3 'orchestra':9 'prerock':10 'unsorted':11
                                    'search_combo'  '00oldiepop':17 '1920s':18 '1930s':19 '20s':9C '30s':11C 'and':10C 'boy':7B 'country':16 'exotica':14 'fletcher':3B 'georgia':6B 'henderson':4B 'his':20 'jazz':13 'oldies':15 'orchestra':21 'popular':12C 'prerock':22 'simpkins':8B 'sing':1A,2A 'unsorted':23 'with':5B
                                    'tag_tracknum'  None
                                      'num_images'  1
                                             'key'  8A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-2', '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-bass-3', 'q-grit-1']
                                      'lastfmtags'  ['jazz', 'swing', 'big band', 'ragtime', '20s']
                                        'tag_date'  1935
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620385357.1254463  (2021-05-07 13:02:37)
                             'size'  2525184