======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '168'
                                          'artist'  'Guy Lombardo & His Royal Canadians'
                                     'text_people'  ''
                                         'release'  '20s and 30s popular'
                                           'title'  'Speak Low'
                                           'quals'  ("['Q-JZFKS-2', 'Q-LOCALNESS-1', 'Q-UNU-1', '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-3', 'q-piano-1', 'q-vocals-4', 'q-mixbeat-1']")
                                      'lastfmtags'  "['jazz', 'classic swing', 'christmas', 'swing', 'canadian']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1944'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '127.846'
                                             'key'  '7A'
                                        '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))                     '127.846'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1944'
'TIT2' (Title/songname/content description)         'Speak Low'
'TKEY' (Initial key)                                '7A'
'TLEN' (Length)                                     '168097'
'TPE1' (Lead performer(s)/Soloist(s))               'Guy Lombardo & His Royal Canadians'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['jazz', 'classic swing', 'christmas', 'swing', 'canadian']
'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'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+1.43 dB'
'TXXX:replaygain_track_peak'                        '0.495731'

========================== row from database ==========================
                                              'id'  1150311
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1920s and 1930s popular/Guy Lombardo & His Royal Canadians - Speak Low (When You Speak Love) 1944.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  168
                                           'genre'  prerock-unsorted
                                        'filesize'  2721461
                                           'mtime'  1620385399
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1920s 1930s (When You Love) 1944 prerock unsorted
                                      'tag_artist'  Guy Lombardo & His Royal Canadians
                                     'tag_release'  20s and 30s popular
                                       'tag_title'  Speak Low
                                             'bpm'  127.846
                                    'search_title'  'low':2 'speak':1
                                   'search_artist'  'canadians':5 'guy':1 'his':3 'lombardo':2 'royal':4
                                  'search_release'  '20s':1 '30s':3 'and':2 'popular':4
                                     'search_rest'  '00oldiepop':5 '1920s':6 '1930s':7 '1944':13 'country':4 'exotica':2 'jazz':1 'love':11,12 'oldies':3 'prerock':14 'unsorted':15 'when':8,9 'you':10
                                    'search_combo'  '00oldiepop':16 '1920s':17 '1930s':18 '1944':24 '20s':8C '30s':10C 'and':9C 'canadians':7B 'country':15 'exotica':13 'guy':3B 'his':5B 'jazz':12 'lombardo':4B 'love':22,23 'low':2A 'oldies':14 'popular':11C 'prerock':25 'royal':6B 'speak':1A 'unsorted':26 'when':19,20 'you':21
                                    'tag_tracknum'  None
                                      'num_images'  1
                                             'key'  7A
                                           '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-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['jazz', 'classic swing', 'christmas', 'swing', 'canadian']
                                        'tag_date'  1944
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620385399.1394756  (2021-05-07 13:03:19)
                             'size'  2721461