fantasia

他的最新画作是一幅色彩斑斓的幻想曲，描绘了各种想象中的生物。

His latest painting is a colorful ___fantasia of imaginary creatures.

钢琴家即兴演奏了一首充满想象力的幻想曲。

The pianist played an imaginative ___fantasia with spontaneous melodies.