Known as Eek-a-Mouse, Ripton Joseph Hylton is a reggae musician from Kingston, Jamaica, who is often called one of the pioneers of "singjay." The word singjay is a portmanteau of "singer" and "deejay," the latter being a form of rhtyhmic Jamaican chant. So, they're basically saying that he combines singing technique with rhythmic chanting (usually traditional Caribbean rhythms) to create his own, unique sound.
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