fantasia
/fænˈteɪzjə/noun
1- a musical composition with a free form and often an improvisatory style幻想曲。
1.1
- a musical composition which is based on several familiar tunes集成曲。
1.2
- a thing that is composed of a mixture of different forms or styles（由不同形式或风格的混合物构成的）结合体; 集成物：
the theatre is a kind of Moorish and Egyptian fantasia.
这所剧院将摩尔建筑风格和埃及建筑风格融为了一体。
词源
early 18th cent.: from Italian, 'fantasy', from Latin phantasia （see FANTASY）.