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Audiences are summoned to the stage at random by the unrehearsed actor.

The videos, which now number more than 260, have become appointment viewing for movie lovers, who relish watching their favorite artists rhapsodize about cinema in unrehearsed, genuine ways.

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.