capriccio

英 [kə'prɪtʃɪəʊ] 美

复数: capricci; capriccios;

1. an instrumental composition that doesn't adhere to rules for any specific musical form and is played with improvisation

capriccio (n.): 1690s as a term in music for a kind of free composition, from Italian capriccio "sudden start or motion" (see caprice). Earlier it meant "prank, trick" (1660s); "caprice" (c. 1600).