Presley's first recording, a blues song titled "That's All Right Mama", was previously recorded in 1946 by Arthur Crudup. In this recording Presley married "black" and "white" genres to an extent that it was denied airplay on (white) country radio stations and (black) R&B stations, dismissed for being defined as both "black" and "white" music. Record Producer Sam Phillips was told by country deejays that Presley's "That's Alright Mama" was "black music" and lamented they would be "run out of town" for playing it. Similarly, R&B deejays categorized it as a (white) country song. When the song was finally played by one rogue deejay, Dewey Phillips, Presley's recording created so much excitement it was described as having waged war on segregated radio stations. "The Sun recordings were the first salvos in an undeclared war on segregated radio stations nationwide."