English Dictionary

impromptu

/ɪmˈpɹɒmptju/

noun

(music) A short musical composition for an informal occasion often with the character of improvisation and usually to be played solo.

He gave an impromptu speech at the event.

意味（1）

(music) A short musical composition for an informal occasion often with the character of improvisation and usually to be played solo.

The second impromptu is a dance-like Allegretto in A flat major, with a trio in D flat major employing arpeggiated textures.

意味（2）

(by extension) Any composition, musical or otherwise, that is created on the spot without preparation.