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And whenever he performed during the show - including an extempore rap performance while inhaling helium from a balloon - fans would celebrate on social media for days.

It was his ability to speak extempore with an eloquence and inventiveness unrivaled in 17th-century Paris.

On stage, James could stretch I’d Rather Go Blind out to 10 minutes of extempore soul-bearing, but the simple, concise studio original is pretty much perfect.

In 1974, when Mr. Braufman was deeply embedded on New York’s radical free-jazz scene, he recorded “Valley of Search,” a record of darkly melodic improvising and portentous incantations and extempore group explosions.

When the roles are reversed in their extempore play, Hal excoriates Falstaff as that “villainous abominable misleader of youth.”