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In page Alice Riley:

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Their best-known collaboration is called "Slumber Boat", which Gaynor sang in her recital work. Soon, the song received notoriety and they were approached by an agent from John Church Company of Cincinnati, Ohio, who wanted to publish a children's kindergarten book. The resulting book, Playtime Songs,[1] was very successful all over the United States and in Canada, England, and English schools in Japan.[citation needed]