======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '130'
                                          'artist'  'Anne Murray'
                                     'text_people'  ''
                                         'release'  'Billboard Top Pop Singles of 1970'
                                           'title'  'Snowbird'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-HHRNBTT-1', 'Q-OLDST-1', 'Q-LOCALNESS-3', "
 "'Q-UNU-1', 'q-syn-2', 'q-bass-4', 'q-busy-3', 'q-grit-2', 'q-play-2', "
 "'q-chart-3', 'q-drums-2', 'q-other-2', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-2']")
                                      'lastfmtags'  "['classic country', 'country', 'female vocalists', 'pop', 'canadian']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '42'
                                      'tracktotal'  ''
                                            'date'  '1970'
                                        'comments'  ''
                                           'genre'  'electronic-generic or radio-unsorted;set-pl-billboard'
                                             'bpm'  '104.768'
                                             'key'  '12B'
                                        'acoustid'  ''
rest: ''

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

'COMM:ID3v1 Comment:XXX'                            'Billboard'
'TALB' (Album/Movie/Show title)                     'Billboard Top Pop Singles of 1970'
'TBPM' (BPM (beats per minute))                     '104.768'
'TCON' (Content type, a.k.a. Genre)                 ['electronic-generic or radio-unsorted', 'set-pl-billboard']
'TDRC' (Recording time)                             '1970'
'TIT2' (Title/songname/content description)         'Snowbird'
'TKEY' (Initial key)                                '12B'
'TPE1' (Lead performer(s)/Soloist(s))               'Anne Murray'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TRCK' (Track number/Position in set)               '42'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['classic country', 'country', 'female vocalists', 'pop', 'canadian']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+0.61 dB'
'TXXX:replaygain_track_peak'                        '0.558345'

========================== row from database ==========================
                                              'id'  1323324
                                            'path'  /data/Music/Bulk/00poprockelectronic/Billboard/Billboard Top100/1970/042 - Anne Murray - Snowbird.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  130
                                           'genre'  electronic-generic or radio-unsorted;set-pl-billboard
                                        'filesize'  2616272
                                           'mtime'  1621630130
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic Top100 042 electronic generic or radio unsorted;set pl billboard
                                      'tag_artist'  Anne Murray
                                     'tag_release'  Billboard Top Pop Singles of 1970
                                       'tag_title'  Snowbird
                                             'bpm'  104.768
                                    'search_title'  'snowbird':1
                                   'search_artist'  'anne':1 'murray':2
                                  'search_release'  '1970':6 'billboard':1 'of':5 'pop':3 'singles':4 'top':2
                                     'search_rest'  '00poprockelectronic':1 'billboard':12 'electronic':3 'generic':4 'or':5 'pl':11 'radio':6 'set':8,10 'top100':2 'unsorted':7,9
                                    'search_combo'  '00poprockelectronic':10 '1970':9C 'anne':2B 'billboard':4C,21 'electronic':12 'generic':13 'murray':3B 'of':8C 'or':14 'pl':20 'pop':6C 'radio':15 'set':17,19 'singles':7C 'snowbird':1A 'top':5C 'top100':11 'unsorted':16,18
                                    'tag_tracknum'  42
                                      'num_images'  0
                                             'key'  12B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-2', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-2', 'q-syn-2', 'q-chart-3', 'q-other-2', 'Q-HAP-3', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['classic country', 'country', 'female vocalists', 'pop', 'canadian']
                                        'tag_date'  1970
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621630129.971169  (2021-05-21 22:48:49)
                             'size'  2616272