======================== unified (from filesystem) ========================
                                         'bitrate'  '149.458'
                                        'duration'  '154'
                                          'artist'  'Chuck Berry'
                                     'text_people'  ''
                                         'release'  'Billboard Top Pop Singles of 1'
                                           'title'  'Rock and Roll Music'
                                           'quals'  ("['Q-JZFKS-1', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', 'Q-OLDST-1', "
 "'q-syn-1', 'q-bass-2', 'q-busy-3', 'q-grit-2', 'q-play-2', 'q-chart-3', "
 "'q-drums-4', 'q-other-2', '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'  '79'
                                      'tracktotal'  ''
                                            'date'  '1957'
                                        'comments'  ''
                                           'genre'  'electronic-generic or radio-unsorted;rock-cppex;set-pl-billboard'
                                             'bpm'  '84.000'
                                             'key'  '5B'
                                        'acoustid'  ''
rest: ''

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

'COMM:ID3v1 Comment:XXX'                            'Billboard'
'TALB' (Album/Movie/Show title)                     'Billboard Top Pop Singles of 1'
'TBPM' (BPM (beats per minute))                     '84.000'
'TCON' (Content type, a.k.a. Genre)                 ['electronic-generic or radio-unsorted', 'rock-cppex', 'set-pl-billboard']
'TDRC' (Recording time)                             '1957'
'TIT2' (Title/songname/content description)         'Rock and Roll Music'
'TKEY' (Initial key)                                '5B'
'TPE1' (Lead performer(s)/Soloist(s))               'Chuck Berry'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TRCK' (Track number/Position in set)               '79'
'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:q-bass'                                       '2'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '4'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+1.69 dB'
'TXXX:replaygain_track_peak'                        '0.531185'

========================== row from database ==========================
                                              'id'  1297119
                                            'path'  /data/Music/Bulk/00poprockelectronic/Billboard/Billboard Top100/079 - Chuck Berry - Rock and Roll Music.mp3
                                         'working'  None
                                         'bitrate'  149
                                    'duration_sec'  154
                                           'genre'  electronic-generic or radio-unsorted;rock-cppex;set-pl-billboard
                                        'filesize'  2895318
                                           'mtime'  1620737053
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic Top100 079 electronic generic or radio unsorted;rock cppex;set pl billboard
                                      'tag_artist'  Chuck Berry
                                     'tag_release'  Billboard Top Pop Singles of 1
                                       'tag_title'  Rock and Roll Music
                                             'bpm'  84.0
                                    'search_title'  'and':2 'music':4 'rock':1 'roll':3
                                   'search_artist'  'berry':2 'chuck':1
                                  'search_release'  '1':6 'billboard':1 'of':5 'pop':3 'singles':4 'top':2
                                     'search_rest'  '00poprockelectronic':1 'billboard':16 'cppex':11,13 'electronic':3 'generic':4 'or':5 'pl':15 'radio':6 'rock':8,10 'set':12,14 'top100':2 'unsorted':7,9
                                    'search_combo'  '00poprockelectronic':13 '1':12C 'and':2A 'berry':6B 'billboard':7C,28 'chuck':5B 'cppex':23,25 'electronic':15 'generic':16 'music':4A 'of':11C 'or':17 'pl':27 'pop':9C 'radio':18 'rock':1A,20,22 'roll':3A 'set':24,26 'singles':10C 'top':8C 'top100':14 'unsorted':19,21
                                    'tag_tracknum'  79
                                      'num_images'  0
                                             'key'  5B
                                           '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-4', 'q-syn-1', 'q-chart-3', 'q-other-2', 'q-bass-2', 'q-grit-2']
                                      'lastfmtags'  ['rock and roll', 'rock n roll', 'blues', 'rock', 'classic rock']
                                        'tag_date'  1957
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620737052.6823635  (2021-05-11 14:44:12)
                             'size'  2895318