======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '338'
                                          'artist'  'Ludwig Van Beethoven'
                                     'text_people'  ''
                                         'release'  'Classical Top 100 Vol. 5'
                                           'title'  'Sonata op13'
                                           'quals'  ("['Q-HAP-2', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
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 "'Q-PIANO-4', 'q-chart-3', 'q-drums-1', 'q-other-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['instrumental', 'composers', 'romantic', 'classical', 'classic']"
                                     'discogstags'  "['classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '7'
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '116.320'
                                             'key'  '5B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Classical Top 100 Vol. 5'
'TBPM' (BPM (beats per minute))                     '116.320'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TIT2' (Title/songname/content description)         'Sonata op13'
'TKEY' (Initial key)                                '5B'
'TPE1' (Lead performer(s)/Soloist(s))               'Ludwig Van Beethoven'
'TRCK' (Track number/Position in set)               '7'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '4'
'TXXX:Q-PLAY'                                       '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  'classical'
'TXXX:lastfmtags'                                   ['instrumental', 'composers', 'romantic', 'classical', 'classic']
'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'                                      '1'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+1.28 dB'
'TXXX:replaygain_track_peak'                        '2.146808'

========================== row from database ==========================
                                              'id'  176721
                                            'path'  /data/Music/Bulk/00instruments-classical/Unsorted/Classical Top 100 Vol. 5__07 - Beethoven - Sonata op13.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  338
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  5412469
                                           'mtime'  1637329808
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical Unsorted 5__07 prerock classical or classical instruments
                                      'tag_artist'  Ludwig Van Beethoven
                                     'tag_release'  Classical Top 100 Vol. 5
                                       'tag_title'  Sonata op13
                                             'bpm'  116.32
                                    'search_title'  'op13':2 'sonata':1
                                   'search_artist'  'beethoven':3 'ludwig':1 'van':2
                                  'search_release'  '100':3 '5':6 'classical':1 'top':2 'vol':4,5
                                     'search_rest'  '00instruments':1 '07':5 '5':4 'classical':2 'instruments':8 'or':7 'prerock':6 'unsorted':3
                                    'search_combo'  '00instruments':12 '07':16 '100':8C '5':11C,15 'beethoven':5B 'classical':6C,13 'instruments':19 'ludwig':3B 'op13':2A 'or':18 'prerock':17 'sonata':1A 'top':7C 'unsorted':14 'van':4B 'vol':9C,10C
                                    'tag_tracknum'  7
                                      'num_images'  0
                                             'key'  5B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-mixbeat-1', 'Q-PIANO-4', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-1', 'Q-HAP-2', 'Q-PLAY-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['instrumental', 'composers', 'romantic', 'classical', 'classic']
                                        'tag_date'  
                                     'discogstags'  ['classical']

============================== file details ==============================
                                           'mtime'  1637329808.0492666  (2021-11-19 14:50:08)
                             'size'  5412469