Definitions from Wiktionary (impromptu)

▸ adjective:  Improvised; without prior preparation, planning or rehearsal.
▸ noun:  (music) A short musical composition for an informal occasion often with the character of improvisation and usually to be played solo.
▸ noun:  (by extension) Any composition, musical or otherwise, that is created on the spot without preparation.
▸ Also see impromptu

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