======================== unified (from filesystem) ========================
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                                        'duration'  '324'
                                          'artist'  'Wolfgang Amadeus Mozart'
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                                         'release'  'Complete Mozart Edition Volume 41 CD 3'
                                           'title'  "Recitativo ed Aria - Non mi dir, bell'idol mio"
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                                      'lastfmtags'  "['instrumental', 'composers', 'piano', 'classical', 'classic']"
                             'musicbrainz_albumid'  ''
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                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
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                                      'tracktotal'  ''
                                            'date'  '1990'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '135.5'
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                                        'acoustid'  ''
rest: ''

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

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'TBPM' (BPM (beats per minute))                     '135.5'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '1990'
'TIT2' (Title/songname/content description)         "Recitativo ed Aria - Non mi dir, bell'idol mio"
'TKEY' (Initial key)                                '7B'
'TPE1' (Lead performer(s)/Soloist(s))               'Wolfgang Amadeus Mozart'
'TRCK' (Track number/Position in set)               '11'
'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'                                   ['instrumental', 'composers', 'piano', 'classical', 'classic']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '1'
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'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'                        '+1.57 dB'
'TXXX:replaygain_track_peak'                        '0.858795'

========================== row from database ==========================
                                              'id'  1505165
                                            'path'  /data/Music/Bulk/00instruments-classical/W A Mozart/Complete Mozart Edition Volume 41 CD 3/11 Recitativo ed Aria - Non mi dir, bell_idol mio.mp3
                                         'working'  None
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                                    'duration_sec'  324
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  7788416
                                           'mtime'  1620561883
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical 11 bell_idol prerock classical or classical instruments
                                      'tag_artist'  Wolfgang Amadeus Mozart
                                     'tag_release'  Complete Mozart Edition Volume 41 CD 3
                                       'tag_title'  Recitativo ed Aria - Non mi dir, bell'idol mio
                                             'bpm'  135.5
                                    'search_title'  'aria':3 'bell':8 'bellidol':10 'dir':6,7 'ed':2 'idol':9 'mi':5 'mio':11 'non':4 'recitativo':1
                                   'search_artist'  'amadeus':2 'mozart':3 'wolfgang':1
                                  'search_release'  '3':7 '41':5 'cd':6 'complete':1 'edition':3 'mozart':2 'volume':4
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                                    'tag_tracknum'  11
                                      'num_images'  0
                                             'key'  7B
                                           '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-1', 'q-syn-1', 'q-chart-3', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['instrumental', 'composers', 'piano', 'classical', 'classic']
                                        'tag_date'  1990
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561882.8651223  (2021-05-09 14:04:42)
                             'size'  7788416