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In page Crystal Kay:

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As of April 2021, she has released thirteen albums. Her seventh studio album, All Yours (2007) became Crystal Kay's only number-one release in her career when it debuted on top of the Oricon chart in June 2007.[6] Throughout her career, Crystal Kay has collaborated with M-Flo and BoA,[7] Chemistry[8] as well as other well-known recording artists. With over 5 million records sold to date, Crystal Kay is one of the best-selling musicians in Japan.[citation needed]