======================== unified (from filesystem) ========================
                                         'bitrate'  '218.315'
                                        'duration'  '179'
                                          'artist'  'Chet Atkins & Doc Watson'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  ' Freight Train Boogie'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-2', 'Q-HHRNBTT-1', 'Q-LOCALNESS-3', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-2', 'q-busy-2', 'q-grit-2', 'q-play-2', "
 "'q-chart-2', 'q-drums-2', 'q-other-3', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['country', 'and group', 'folk', 'bluegrass', 'guitar virtuoso']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1945'
                                        'comments'  ''
                                           'genre'  'loc-namerica-country'
                                             'bpm'  '112.383'
                                             'key'  '12B'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '112.383'
'TCON' (Content type, a.k.a. Genre)                 'loc-namerica-country'
'TDRC' (Recording time)                             '1945'
'TIT2' (Title/songname/content description)         ' Freight Train Boogie'
'TKEY' (Initial key)                                '12B'
'TPE1' (Lead performer(s)/Soloist(s))               'Chet Atkins & 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'                                   ['country', 'and group', 'folk', 'bluegrass', 'guitar virtuoso']
'TXXX:q-bass'                                       '2'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+0.55 dB'
'TXXX:replaygain_track_peak'                        '0.557138'

========================== row from database ==========================
                                              'id'  967765
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/Old Country Music/Chet Atkins & Doc Watson - Freight Train Boogie.wma.mp3
                                         'working'  None
                                         'bitrate'  218
                                    'duration_sec'  179
                                           'genre'  loc-namerica-country
                                        'filesize'  4896302
                                           'mtime'  1621628042
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country Old Country Music Boogie.wma loc namerica country
                                      'tag_artist'  Chet Atkins & Doc Watson
                                     'tag_release'  None
                                       'tag_title'   Freight Train Boogie
                                             'bpm'  112.383
                                    'search_title'  'boogie':3 'freight':1 'train':2
                                   'search_artist'  'atkins':2 'chet':1 'doc':3 'watson':4
                                  'search_release'  
                                     'search_rest'  'boogie':7 'boogiewma':9 'country':4 'exotica':2 'jazz':1 'loc':10 'music':6 'namerica':11 'old':5 'oldies':3 'wma':8
                                    'search_combo'  'atkins':5B 'boogie':3A,14 'boogiewma':16 'chet':4B 'country':11 'doc':6B 'exotica':9 'freight':1A 'jazz':8 'loc':17 'music':13 'namerica':18 'old':12 'oldies':10 'train':2A 'watson':7B 'wma':15
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  12B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', '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-2', 'q-syn-1', 'q-chart-2', 'q-other-3', 'Q-HAP-3', 'q-bass-2', 'q-grit-2']
                                      'lastfmtags'  ['country', 'and group', 'folk', 'bluegrass', 'guitar virtuoso']
                                        'tag_date'  1945
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621628042.371904  (2021-05-21 22:14:02)
                             'size'  4896302