======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '217'
                                          'artist'  'Argent'
                                     'text_people'  ''
                                         'release'  'Billboard Top Pop Singles of 1972'
                                           'title'  'Hold Your Head Up'
                                           'quals'  ("['Q-JZFKS-1', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', 'Q-UNU-1', 'Q-OLDST-2', "
 "'q-syn-2', 'q-bass-3', 'q-busy-3', 'q-grit-2', 'q-play-2', 'q-chart-3', "
 "'q-drums-3', 'q-other-3', 'q-piano-1', 'q-vocals-3', 'q-mixbeat-2']")
                                      'lastfmtags'  "['british', '70s', 'rock', 'hard rock', 'progressive rock', 'classic rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '50'
                                      'tracktotal'  ''
                                            'date'  '1972'
                                        'comments'  ''
                                           'genre'  'electronic-generic or radio-unsorted;rock-cppex'
                                             'bpm'  '88.130'
                                             'key'  '10B'
                                        'acoustid'  ''
rest: ''

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

'COMM:ID3v1 Comment:XXX'                            'Billboard'
'TALB' (Album/Movie/Show title)                     'Billboard Top Pop Singles of 1972'
'TBPM' (BPM (beats per minute))                     '88.130'
'TCON' (Content type, a.k.a. Genre)                 ['electronic-generic or radio-unsorted', 'rock-cppex']
'TDRC' (Recording time)                             '1972'
'TIT2' (Title/songname/content description)         'Hold Your Head Up'
'TKEY' (Initial key)                                '10B'
'TPE1' (Lead performer(s)/Soloist(s))               'Argent'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TRCK' (Track number/Position in set)               '50'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['british', '70s', 'rock', 'hard rock', 'progressive rock', 'classic rock']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'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'                                     '3'
'TXXX:replaygain_track_gain'                        '+0.80 dB'
'TXXX:replaygain_track_peak'                        '0.587041'

========================== row from database ==========================
                                              'id'  1288700
                                            'path'  /data/Music/Bulk/00poprockelectronic/Billboard/Billboard Top100/1972/050 - Argent - Hold Your Head Up.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  217
                                           'genre'  electronic-generic or radio-unsorted;rock-cppex
                                        'filesize'  4360413
                                           'mtime'  1620737083
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic Top100 050 electronic generic or radio unsorted;rock cppex
                                      'tag_artist'  Argent
                                     'tag_release'  Billboard Top Pop Singles of 1972
                                       'tag_title'  Hold Your Head Up
                                             'bpm'  88.13
                                    'search_title'  'head':3 'hold':1 'up':4 'your':2
                                   'search_artist'  'argent':1
                                  'search_release'  '1972':6 'billboard':1 'of':5 'pop':3 'singles':4 'top':2
                                     'search_rest'  '00poprockelectronic':1 'cppex':11 'electronic':3 'generic':4 'or':5 'radio':6 'rock':8,10 'top100':2 'unsorted':7,9
                                    'search_combo'  '00poprockelectronic':12 '1972':11C 'argent':5B 'billboard':6C 'cppex':22 'electronic':14 'generic':15 'head':3A 'hold':1A 'of':10C 'or':16 'pop':8C 'radio':17 'rock':19,21 'singles':9C 'top':7C 'top100':13 'unsorted':18,20 'up':4A 'your':2A
                                    'tag_tracknum'  50
                                      'num_images'  0
                                             'key'  10B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-2', 'q-play-2', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-3', 'q-syn-2', 'q-chart-3', 'q-other-3', 'q-bass-3', 'q-grit-2']
                                      'lastfmtags'  ['british', '70s', 'rock', 'hard rock', 'progressive rock', 'classic rock']
                                        'tag_date'  1972
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620737082.8032749  (2021-05-11 14:44:42)
                             'size'  4360413