Warm-up comedian

A warm-up comedian or crowd warmer is a stand-up comedian who performs at a comedy club or before the filming of a television comedy in front of studio audience to get the crowd into the mood ready for the show or main act. Their role is to make the audience feel integral to the show and encourage reactions during the show. They usually work alone...
Found on http://en.wikipedia.org/wiki/Warm-up_comedian
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