======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '179'
                                          'artist'  'Clarence Williams '
                                     'text_people'  ''
                                         'release'  '1920s and 1930s popular'
                                           'title'  'Coal Cart Blues'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-2', 'Q-JZFKS-2', '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-4', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['jazz', 'blues', 'piano', '30s', 'early jazz']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1925'
                                        'comments'  ''
                                           'genre'  'prerock-jb-jazz-unsorted'
                                             'bpm'  '84.280'
                                             'key'  '12B'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'TALB' (Album/Movie/Show title)                     '1920s and 1930s popular'
'TBPM' (BPM (beats per minute))                     '84.280'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-jazz-unsorted'
'TDRC' (Recording time)                             '1925'
'TIT2' (Title/songname/content description)         'Coal Cart Blues'
'TKEY' (Initial key)                                '12B'
'TLEN' (Length)                                     '179912'
'TPE1' (Lead performer(s)/Soloist(s))               'Clarence Williams '
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['jazz', 'blues', 'piano', '30s', 'early jazz']
'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'                                     '3'
'TXXX:replaygain_track_gain'                        '+0.95 dB'
'TXXX:replaygain_track_peak'                        '0.441236'

========================== row from database ==========================
                                              'id'  1150955
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1920s and 1930s popular/Clarence Williams Blue Five, Louis Armstrong, Sidney Bechet - Coal Cart Blues.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  179
                                           'genre'  prerock-jb-jazz-unsorted
                                        'filesize'  2918405
                                           'mtime'  1620524451
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop Five, Louis Armstrong, Sidney Bechet prerock jb jazz unsorted
                                      'tag_artist'  Clarence Williams 
                                     'tag_release'  1920s and 1930s popular
                                       'tag_title'  Coal Cart Blues
                                             'bpm'  84.28
                                    'search_title'  'blues':3 'cart':2 'coal':1
                                   'search_artist'  'clarence':1 'williams':2
                                  'search_release'  '1920s':1 '1930s':3 'and':2 'popular':4
                                     'search_rest'  '00oldiepop':5 'armstrong':9,10 'bechet':12 'country':4 'exotica':2 'five':6,7 'jazz':1 'jb':14 'louis':8 'oldies':3 'prerock':13 'sidney':11 'unsorted':15
                                    'search_combo'  '00oldiepop':14 '1920s':6C '1930s':8C 'and':7C 'armstrong':18,19 'bechet':21 'blues':3A 'cart':2A 'clarence':4B 'coal':1A 'country':13 'exotica':11 'five':15,16 'jazz':10 'jb':23 'louis':17 'oldies':12 'popular':9C 'prerock':22 'sidney':20 'unsorted':24 'williams':5B
                                    'tag_tracknum'  None
                                      'num_images'  1
                                             'key'  12B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-2', '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'  ['jazz', 'blues', 'piano', '30s', 'early jazz']
                                        'tag_date'  1925
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620524451.2454915  (2021-05-09 03:40:51)
                             'size'  2918405