======================== unified (from filesystem) ========================
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                                          'artist'  'Ludwig van Beethoven'
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                                           'title'  'Bagatelle for Piano in A minor, WoO 59 "Für Elise"'
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                             'musicbrainz_albumid'  ''
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                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '5'
                                      'tracktotal'  '10'
                                            'date'  '1991'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '144'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'TALB' (Album/Movie/Show title)                     '100 Masterpieces, Volume 4: The Top 10 of Classical Music 1788-1810'
'TBPM' (BPM (beats per minute))                     '144'
'TCMP'                                              '1'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDOR' (Original release time)                      '1991'
'TDRC' (Recording time)                             '1991-03-19'
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'TIT2' (Title/songname/content description)         'Bagatelle for Piano in A minor, WoO 59 "Für Elise"'
'TKEY' (Initial key)                                '8A'
'TMED' (Media type)                                 'CD'
'TPE1' (Lead performer(s)/Soloist(s))               'Ludwig van Beethoven'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TPOS' (Part of a set)                              '1/1'
'TPUB' (Publisher)                                  'LaserLight Digital'
'TRCK' (Track number/Position in set)               '5/10'
'TSO2'                                              'Various Artists'
'TSOP' (Performer sort order)                       'Beethoven, Ludwig van'
'TXXX:Artists'                                      'Ludwig van Beethoven'
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'TXXX:MusicBrainz Album Status'                     'official'
'TXXX:MusicBrainz Album Type'                       'album/compilation'
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'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '4'
'TXXX:Q-PLAY'                                       '3'
'TXXX:Q-UNU'                                        '1'
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'TXXX:lastfmtags'                                   ['instrumental', 'composers', 'romantic', 'classical', 'classic']
'TXXX:originalyear'                                 '1991'
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+2.87 dB'
'TXXX:replaygain_track_peak'                        '0.799727'
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========================== row from database ==========================
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                                            'path'  /data/Music/Bulk/00instruments-classical/The Top 100 Masterpieces of Classical Music 1685-1928/Disc 4 - 1788-1810/05 - 1810 Beethoven- Fur Elise.mp3
                                         'working'  None
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                                    'duration_sec'  172
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  3178912
                                           'mtime'  1637329806
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical 1685 1928 Disc 05 Fur prerock classical classical instruments
                                      'tag_artist'  Ludwig van Beethoven
                                     'tag_release'  100 Masterpieces, Volume 4: The Top 10 of Classical Music 1788-1810
                                       'tag_title'  Bagatelle for Piano in A minor, WoO 59 "Für Elise"
                                             'bpm'  144.0
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                                     'search_rest'  '00instruments':1 '1685':3 '1928':4 'classical':2 'disc':5 'fur':6 'instruments':8 'prerock':7
                                    'search_combo'  '00instruments':32 '100':18C '1685':34 '1788':29C '17881810':31C '1810':30C '1928':35 '4':22C,23C '59':9A 'a':5A 'bagatelle':1A 'beethoven':17B 'classical':27C,33 'disc':36 'elise':12A 'for':2A 'fur':10A,11A,37 'in':4A 'instruments':39 'ludwig':15B 'masterpieces':19C,20C 'minor':6A,7A 'music':28C 'o':14A 'of':26C 'piano':3A 'prerock':38 'the':24C 'top':25C 'van':16B 'volume':21C 'wo':13A 'woo':8A
                                    'tag_tracknum'  5
                                      'num_images'  1
                                             'key'  8A
                                           '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-2', 'q-other-2', 'Q-HAP-2', 'Q-PLAY-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['instrumental', 'composers', 'romantic', 'classical', 'classic']
                                        'tag_date'  1991
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1637329806.2986689  (2021-11-19 14:50:06)
                             'size'  3178912