======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '160'
                                          'artist'  'Chuck Berry'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Johnny B. Goode'
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'Q-JZFKS-1', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-3', 'q-busy-3', 'q-grit-2', 'q-play-2', "
 "'q-chart-1', 'q-drums-2', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['rock and roll', 'rock n roll', 'blues', 'rock', 'classic rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1958'
                                        'comments'  ''
                                           'genre'  'rock-pop-early;set-pl-billboard'
                                             'bpm'  '111.948'
                                             'key'  '6B'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '111.948'
'TCON' (Content type, a.k.a. Genre)                 ['rock-pop-early', 'set-pl-billboard']
'TDRC' (Recording time)                             '1958'
'TIT2' (Title/songname/content description)         'Johnny B. Goode'
'TKEY' (Initial key)                                '6B'
'TPE1' (Lead performer(s)/Soloist(s))               'Chuck Berry'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['rock and roll', 'rock n roll', 'blues', 'rock', 'classic rock']
'TXXX:other'                                        '58-080'
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'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'                                     '4'
'TXXX:replaygain_track_gain'                        '+0.13 dB'
'TXXX:replaygain_track_peak'                        '0.555197'

========================== row from database ==========================
                                              'id'  1437061
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1958/58-080 - Chuck Berry - Johnny B. Goode.mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  160
                                           'genre'  rock-pop-early;set-pl-billboard
                                        'filesize'  6421580
                                           'mtime'  1620736357
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1958 58 080 rock pop early;set pl billboard
                                      'tag_artist'  Chuck Berry
                                     'tag_release'  None
                                       'tag_title'  Johnny B. Goode
                                             'bpm'  111.948
                                    'search_title'  'b':2,3 'goode':4 'johnny':1
                                   'search_artist'  'berry':2 'chuck':1
                                  'search_release'  
                                     'search_rest'  '00oldiepop':5 '1958':6 '58':7 'billboard':15 'country':4 'early':10,12 'exotica':2 'jazz':1 'oldies':3 'pl':14 'pop':9 'rock':8 'set':11,13
                                    'search_combo'  '00oldiepop':11 '1958':12 '58':13 'b':2A,3A 'berry':6B 'billboard':21 'chuck':5B 'country':10 'early':16,18 'exotica':8 'goode':4A 'jazz':7 'johnny':1A 'oldies':9 'pl':20 'pop':15 'rock':14 'set':17,19
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  6B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-2', 'q-syn-1', 'q-chart-1', 'q-other-3', 'Q-HAP-3', 'q-bass-3', 'q-grit-2']
                                      'lastfmtags'  ['rock and roll', 'rock n roll', 'blues', 'rock', 'classic rock']
                                        'tag_date'  1958
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620736357.3258958  (2021-05-11 14:32:37)
                             'size'  6421580