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Before Earth, Wind & Fire, Kim was in a singing group with her sister Kandy Johnson Isley called JS, which stands for Johnson Sisters. The duo released their debut and only album, produced by R. Kelly, entitled Ice Cream, in July 2003. The Johnson sisters have backed such artists as Michael Jackson, Sting, Christina Aguilera and the Isley Brothers. Singer Ronald Isley took them under his wing and become their manager and introduced them to R. Kelly, who wrote several songs for them.