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In page Josephine Baker:

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Baker performed as the last dancer on the end of the chorus line, where her act was to perform in a comic manner, as if she were unable to remember the dance, until the encore, at which point she would perform it not only correctly but with additional complexity. A term of the time describes this part of the cast as “The Pony.” Baker was billed at the time as "the highest-paid chorus girl in vaudeville".[3]