======================== unified (from filesystem) ========================
                                         'bitrate'  '162.279'
                                        'duration'  '116'
                                          'artist'  'Bill Monroe & Doc Watson'
                                     'text_people'  ''
                                         'release'  'Old Country Music'
                                           'title'  ' Kentucky Mandolin'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-2', 'Q-HHRNBTT-1', 'Q-LOCALNESS-3', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-2', 'q-play-2', "
 "'q-chart-2', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['bluegrass', 'country', 'americana', 'gospel']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1945'
                                        'comments'  ''
                                           'genre'  'loc-namerica-country'
                                             'bpm'  '125.939'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Old Country Music'
'TBPM' (BPM (beats per minute))                     '125.939'
'TCON' (Content type, a.k.a. Genre)                 'loc-namerica-country'
'TDRC' (Recording time)                             '1945'
'TIT2' (Title/songname/content description)         ' Kentucky Mandolin'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Bill Monroe & Doc Watson'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '2'
'TXXX:lastfmtags'                                   ['bluegrass', 'country', 'americana', 'gospel']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'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'                        '+0.95 dB'
'TXXX:replaygain_track_peak'                        '0.614793'

========================== row from database ==========================
                                              'id'  966455
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/Old Country Music/Bill Monroe & Doc Watson - Kentucky Mandolin.wma.mp3
                                         'working'  None
                                         'bitrate'  162
                                    'duration_sec'  116
                                           'genre'  loc-namerica-country
                                        'filesize'  2371711
                                           'mtime'  1621628015
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country Mandolin.wma loc namerica country
                                      'tag_artist'  Bill Monroe & Doc Watson
                                     'tag_release'  Old Country Music
                                       'tag_title'   Kentucky Mandolin
                                             'bpm'  125.939
                                    'search_title'  'kentucky':1 'mandolin':2
                                   'search_artist'  'bill':1 'doc':3 'monroe':2 'watson':4
                                  'search_release'  'country':2 'music':3 'old':1
                                     'search_rest'  'country':4 'exotica':2 'jazz':1 'loc':8 'mandolin':5 'mandolinwma':7 'namerica':9 'oldies':3 'wma':6
                                    'search_combo'  'bill':3B 'country':8C,13 'doc':5B 'exotica':11 'jazz':10 'kentucky':1A 'loc':17 'mandolin':2A,14 'mandolinwma':16 'monroe':4B 'music':9C 'namerica':18 'old':7C 'oldies':12 'watson':6B 'wma':15
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['bluegrass', 'country', 'americana', 'gospel']
                                        'tag_date'  1945
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621628014.9297543  (2021-05-21 22:13:34)
                             'size'  2371711