======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '151'
                                          'artist'  'Robert Johnson'
                                     'text_people'  ''
                                         'release'  'The Complete Recordings (Disc 1)'
                                           'title'  'Walking Blues'
                                           'quals'  ("['Q-HAP-2', 'Q-JZFKS-3', 'Q-LOCALNESS-3', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-2', 'q-play-3', "
 "'q-chart-3', 'q-drums-1', 'q-other-2', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['guitar', 'acoustic', 'blues', 'delta blues', 'folk']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '19'
                                      'tracktotal'  ''
                                            'date'  '1936'
                                        'comments'  ''
                                           'genre'  'prerock-jb-blues'
                                             'bpm'  '107.4'
                                             'key'  '1A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'The Complete Recordings (Disc 1)'
'TBPM' (BPM (beats per minute))                     '107.4'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-blues'
'TDRC' (Recording time)                             '1936'
'TIT2' (Title/songname/content description)         'Walking Blues'
'TKEY' (Initial key)                                '1A'
'TPE1' (Lead performer(s)/Soloist(s))               'Robert Johnson'
'TRCK' (Track number/Position in set)               '19'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '3'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['guitar', 'acoustic', 'blues', 'delta blues', 'folk']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+2.01 dB'
'TXXX:replaygain_track_peak'                        '0.512437'

========================== row from database ==========================
                                              'id'  678672
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/Robert Johnson CD1/19 Robert Johnson - Walking Blues.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  151
                                           'genre'  prerock-jb-blues
                                        'filesize'  3635200
                                           'mtime'  1620402521
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country CD1 19 prerock jb blues
                                      'tag_artist'  Robert Johnson
                                     'tag_release'  The Complete Recordings (Disc 1)
                                       'tag_title'  Walking Blues
                                             'bpm'  107.4
                                    'search_title'  'blues':2 'walking':1
                                   'search_artist'  'johnson':2 'robert':1
                                  'search_release'  '1':6,7 'complete':2 'disc':4,5 'recordings':3 'the':1
                                     'search_rest'  '19':6 'blues':9 'cd1':5 'country':4 'exotica':2 'jazz':1 'jb':8 'oldies':3 'prerock':7
                                    'search_combo'  '1':10C,11C '19':17 'blues':2A,20 'cd1':16 'complete':6C 'country':15 'disc':8C,9C 'exotica':13 'jazz':12 'jb':19 'johnson':4B 'oldies':14 'prerock':18 'recordings':7C 'robert':3B 'the':5C 'walking':1A
                                    'tag_tracknum'  19
                                      'num_images'  0
                                             'key'  1A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-3', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-2', 'Q-HAP-2', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['guitar', 'acoustic', 'blues', 'delta blues', 'folk']
                                        'tag_date'  1936
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620402520.930004  (2021-05-07 17:48:40)
                             'size'  3635200