======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '309'
                                          'artist'  'Thin Lizzy'
                                     'text_people'  ''
                                         'release'  'rock monsters unleash the beast '
                                           'title'  'The Rocker'
                                           'quals'  ("['Q-OLDST-3', 'Q-UNU-2', 'Q-JZFKS-1', 'Q-HHRNBTT-1', 'Q-LOCALNESS-1', "
 "'q-syn-2', 'q-bass-3', 'q-busy-3', 'q-grit-2', 'q-play-2', 'q-chart-4', "
 "'q-drums-3', 'q-other-3', 'q-piano-1', 'q-vocals-2', 'q-mixbeat-2']")
                                      'lastfmtags'  "['heavy metal', 'rock', 'hard rock', 'irish', 'classic rock']"
                                     'discogstags'  "['rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '2'
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'rock-unsorted'
                                             'bpm'  '96.992'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'rock monsters unleash the beast '
'TBPM' (BPM (beats per minute))                     '96.992'
'TCON' (Content type, a.k.a. Genre)                 'rock-unsorted'
'TIT2' (Title/songname/content description)         'The Rocker'
'TKEY' (Initial key)                                '9A'
'TPE1' (Lead performer(s)/Soloist(s))               'Thin Lizzy'
'TRCK' (Track number/Position in set)               '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '2'
'TXXX:discogstags'                                  'rock'
'TXXX:lastfmtags'                                   ['heavy metal', 'rock', 'hard rock', 'irish', 'classic rock']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '2'
'TXXX:replaygain_track_gain'                        '-0.12 dB'
'TXXX:replaygain_track_peak'                        '0.520709'

========================== row from database ==========================
                                              'id'  1420101
                                            'path'  /data/Music/Bulk/00popandrock-classicprogpsy/Thin Lizzy/MBZ;#Thin Lizzy;#Dedication;#02;#The Rocker.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  309
                                           'genre'  rock-unsorted
                                        'filesize'  7425920
                                           'mtime'  1620387846
                                   'redo_metaread'  0
                                        'rest_str'   00popandrock classicprogpsy MBZ;#Thin Lizzy;#Dedication;#02;#The unsorted
                                      'tag_artist'  Thin Lizzy
                                     'tag_release'  rock monsters unleash the beast 
                                       'tag_title'  The Rocker
                                             'bpm'  96.992
                                    'search_title'  'rocker':2 'the':1
                                   'search_artist'  'lizzy':2 'thin':1
                                  'search_release'  'beast':5 'monsters':2 'rock':1 'the':4 'unleash':3
                                     'search_rest'  '02':8,12 'classicprogpsy':1 'dedication':7,11 'lizzy':6,10 'mbz':2,4 'the':9,13 'thin':3,5 'unsorted':14
                                    'search_combo'  '02':17,21 'beast':9C 'classicprogpsy':10 'dedication':16,20 'lizzy':4B,15,19 'mbz':11,13 'monsters':6C 'rock':5C 'rocker':2A 'the':1A,8C,18,22 'thin':3B,12,14 'unleash':7C 'unsorted':23
                                    'tag_tracknum'  2
                                      'num_images'  0
                                             'key'  9A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-2', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-2', 'q-play-2', 'Q-OLDST-3', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-3', 'q-syn-2', 'q-chart-4', 'q-other-3', 'q-bass-3', 'q-grit-2']
                                      'lastfmtags'  ['heavy metal', 'rock', 'hard rock', 'irish', 'classic rock']
                                        'tag_date'  
                                     'discogstags'  ['rock']

============================== file details ==============================
                                           'mtime'  1620387846.2161102  (2021-05-07 13:44:06)
                             'size'  7425920