Nobody was sure what to call Presley's music, so Elvis was described as "The Hillbilly Cat" and "King of Western Bop." Over the next year, Elvis would record four more singles for Sun. Rockabilly recorded by artists prior to Presley can be described as being in the long-standing country style of Rockabilly. Presley's recordings are described by some as quintessential rockabilly for their true union of country and R&B, which can be described as the true realization of the Rockabilly genre. In addition to the fusion of distinct genres, Presley's recordings contain some traditional as well as new traits: "nervously up tempo" (as Peter Guralnick describes it), with slap bass, fancy guitar picking, much echo, shouts of encouragement, and vocals full of histrionics such as hiccups, stutters, and swoops from falsetto to bass and back again.