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In page Hillbilly:

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By the late-1940s, radio stations started to use the "hillbilly music" label. Originally, "hillbilly" was used to describe fiddlers and string bands, but now it was used to describe traditional Appalachian music. Appalachians had never used this term to describe their own music. Popular songs whose style bore characteristics of both hillbilly and African American music were referred to as hillbilly boogie and rockabilly. Elvis Presley was a prominent player of rockabilly and was known early in his career as the "Hillbilly Cat".[citation needed]