ca·pric·cio /kəˈpriʧ(iˌ)o/
  惡作劇,任性,狂想曲
  Ca·pric·cio n.
  1. Mus. A piece in a free form, with frequent digressions from the theme; a fantasia; -- often called caprice.
  2. A caprice; a freak; a fancy.
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  capriccio
       n : an instrumental composition that doesn't adhere to rules for
           any specific musical form and is played with
           improvisation
       [also: capricci (pl)]