- title: Classical by Composer
  children:
  - title: "[Youtube] Antonio Lucio Vivaldi"
    url: https://youtube.com/playlist?list=PLSU6wJEYct5HslkoJWHQFCttB-lhSwVr2
  - title: "[Youtube] Johann Sebastian Bach"
    url: https://youtube.com/playlist?list=PLSU6wJEYct5HftuY6UunC6zE_QMXOGmhm
  - title: "[Youtube] Ludwig van Beethoven"
    url: https://youtube.com/playlist?list=PLSU6wJEYct5Etx0WAXUQ7YXe84Fp5E142
  - title: "[Youtube] Wolfgang Amadeus Mozart"
    url: https://youtube.com/playlist?list=PLSU6wJEYct5EJsE-9Zh-jWckBuZAmIt8Q