Improvise à la Ella Fitzgerald

SCAT

Not available

Ella Fitzgerald was famous for "scat singing," a jazz technique where singers improvise nonsense syllables instead of words. The clue hints at this by saying "improvise" and referencing her name, since she was a master of the style. "À la" just means "in the style of," so the answer is the term for that vocal improvisation: "scat.