======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '238'
                                          'artist'  'doc watson'
                                     'text_people'  ''
                                         'release'  'country and western songbook'
                                           'title'  'Mountain Dew'
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'Q-JZFKS-1', 'Q-OLDST-1', 'Q-LOCALNESS-2', "
 "'Q-HHRNBTT-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-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['bluegrass', 'folk', 'country', 'americana', 'acoustic']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '85'
                                      'tracktotal'  ''
                                            'date'  '1960'
                                        'comments'  ''
                                           'genre'  'loc-namerica-country'
                                             'bpm'  '96.530'
                                             'key'  '9B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'country and western songbook'
'TBPM' (BPM (beats per minute))                     '96.530'
'TCON' (Content type, a.k.a. Genre)                 'loc-namerica-country'
'TDRC' (Recording time)                             '1960'
'TIT2' (Title/songname/content description)         'Mountain Dew'
'TKEY' (Initial key)                                '9B'
'TPE1' (Lead performer(s)/Soloist(s))               'doc watson'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TRCK' (Track number/Position in set)               '85'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['bluegrass', 'folk', 'country', 'americana', 'acoustic']
'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'                                     '4'
'TXXX:replaygain_track_gain'                        '+1.08 dB'
'TXXX:replaygain_track_peak'                        '0.903357'

========================== row from database ==========================
                                              'id'  472788
                                            'path'  /data/Music/Bulk/00localcharacter/america - country and western songbook - second - 0716/85 - doc watson - Mountain Dew.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  238
                                           'genre'  loc-namerica-country
                                        'filesize'  4770272
                                           'mtime'  1621700244
                                   'redo_metaread'  0
                                        'rest_str'   00localcharacter america second 0716 85 loc namerica
                                      'tag_artist'  doc watson
                                     'tag_release'  country and western songbook
                                       'tag_title'  Mountain Dew
                                             'bpm'  96.53
                                    'search_title'  'dew':2 'mountain':1
                                   'search_artist'  'doc':1 'watson':2
                                  'search_release'  'and':2 'country':1 'songbook':4 'western':3
                                     'search_rest'  '0716':3 '85':4 'america':1 'loc':5 'namerica':6 'second':2
                                    'search_combo'  '0716':11 '85':12 'america':9 'and':6C 'country':5C 'dew':2A 'doc':3B 'loc':13 'mountain':1A 'namerica':14 'second':10 'songbook':8C 'watson':4B 'western':7C
                                    'tag_tracknum'  85
                                      'num_images'  0
                                             'key'  9B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', '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', 'folk', 'country', 'americana', 'acoustic']
                                        'tag_date'  1960
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621700244.1721885  (2021-05-22 18:17:24)
                             'size'  4770272