Improviser

im·pro·vise  (mpr-vz)

v. im·pro·vised, im·pro·vis·ing, im·pro·vis·es

v.tr.

1. To invent, compose, or perform with little or no preparation.

2. To play or sing (music) extemporaneously, especially by inventing variations on a melody or creating new melodies in accordance with a set progression of chords.

3. To make or provide from available materials: improvised a dinner from what I found in the refrigerator.

v.intr.

1. To invent, compose, or perform something extemporaneously.

2. To improvise music.

3. To make do with whatever materials are at hand.

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[French improviser, from Italian improvvisare, from improvviso, unforeseen, from Latin imprvsus : in-, not; see in-¹ + prvsus, past participle of prvidre, to foresee; see provide.]

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impro·viser, impro·visor n.