Improvised; without prior preparation, planning or rehearsal.
The party began with an impromptu rendition of 'Happy Birthday'.
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.
Borrowed from French impromptu.
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Any composition, musical or otherwise, that is created on the spot without preparation.