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Usher's moves are so effortless that they look unrehearsed, but such ease comes at a cost: Last year, he had to postpone the start of the tour after injuring his neck in practice.

Later in life, she became a pioneer of spiritual jazz — where she blended unrehearsed rhythms with the sounds of her faith.

At least until the mischievous rocker dug into his bag of rock ‘n’ roll tricks for an unrehearsed delight during the string quartet section of Tuesday’s Benaroya Hall show.

It’s life, it’s gritty, it’s authentic — it’s unrehearsed.

In a 1987 interview with The Times, Barker said he liked “to try to create spontaneous laughter with these unrehearsed contestants, so each show for me is like mining for gold.”