======================== unified (from filesystem) ========================
                                         'bitrate'  '219.099'
                                        'duration'  '148'
                                          'artist'  'Arthur Smith & Don Reno'
                                     'text_people'  ''
                                         'release'  'Old Country Music'
                                           'title'  'Pennsylvania Polka'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-2', 'Q-HHRNBTT-1', 'Q-LOCALNESS-3', "
 "'Q-OLDST-1', 'Q-PLAY-2', 'q-syn-1', 'q-bass-4', 'q-busy-2', 'q-grit-2', "
 "'Q-PIANO-2', 'q-chart-2', 'q-drums-3', 'q-other-3', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['bluegrass', 'folk']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1945'
                                        'comments'  ''
                                           'genre'  'loc-namerica-country'
                                             'bpm'  '95.890'
                                             'key'  '9B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Old Country Music'
'TBPM' (BPM (beats per minute))                     '95.890'
'TCON' (Content type, a.k.a. Genre)                 'loc-namerica-country'
'TDRC' (Recording time)                             '1945'
'TIT2' (Title/songname/content description)         'Pennsylvania Polka'
'TKEY' (Initial key)                                '9B'
'TPE1' (Lead performer(s)/Soloist(s))               'Arthur Smith & Don Reno'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '2'
'TXXX:Q-PLAY'                                       '2'
'TXXX:Q-UNU'                                        '2'
'TXXX:lastfmtags'                                   ['bluegrass', 'folk']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+0.61 dB'
'TXXX:replaygain_track_peak'                        '0.715393'

========================== row from database ==========================
                                              'id'  966503
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/Old Country Music/Arthur Smith & Don Reno - Pennsylvania Polka.wma.mp3
                                         'working'  None
                                         'bitrate'  219
                                    'duration_sec'  148
                                           'genre'  loc-namerica-country
                                        'filesize'  4066865
                                           'mtime'  1621628010
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country Polka.wma loc namerica country
                                      'tag_artist'  Arthur Smith & Don Reno
                                     'tag_release'  Old Country Music
                                       'tag_title'  Pennsylvania Polka
                                             'bpm'  95.89
                                    'search_title'  'pennsylvania':1 'polka':2
                                   'search_artist'  'arthur':1 'don':3 'reno':4 'smith':2
                                  'search_release'  'country':2 'music':3 'old':1
                                     'search_rest'  'country':4 'exotica':2 'jazz':1 'loc':8 'namerica':9 'oldies':3 'polka':5 'polkawma':7 'wma':6
                                    'search_combo'  'arthur':3B 'country':8C,13 'don':5B 'exotica':11 'jazz':10 'loc':17 'music':9C 'namerica':18 'old':7C 'oldies':12 'pennsylvania':1A 'polka':2A,14 'polkawma':16 'reno':6B 'smith':4B 'wma':15
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  9B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-3', 'q-mixbeat-1', 'Q-PIANO-2', 'Q-OLDST-1', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-3', 'q-syn-1', 'q-chart-2', 'q-other-3', 'Q-HAP-3', 'Q-PLAY-2', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['bluegrass', 'folk']
                                        'tag_date'  1945
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621628009.522599  (2021-05-21 22:13:29)
                             'size'  4066865