Perez Prado's mambo records." He was especially enamored with Afro-Cuban music. Michael Campbell states: "Professor Longhair's influence was... far-reaching. In several of his early recordings, Professor Longhair blended Afro-Cuban rhythms with rhythm and blues. The most explicit is 'Longhair's Blues Rhumba,' where he overlays a straightforward blues with a clave rhythm." Longhair's particular style was known locally as rumba-boogie. In his "Mardi Gras in New Orleans", the pianist employs the 2–3 clave onbeat/offbeat motif in a rumba boogie "guajeo". The syncopated, but straight subdivision feel of Cuban music (as opposed to swung subdivisions) took root in New Orleans R&B during this time. Alexander Stewart states that the popular feel was passed along from "New Orleans—through James Brown's music, to the popular music of the 1970s," adding: "The singular style of rhythm & blues that emerged from New Orleans in the years after World War II played an important role in the development of funk. In a related development, the underlying rhythms of American popular music underwent a basic, yet generally unacknowledged transition from a triplet or shuffle feel to even or straight eighth notes. Concerning the various funk motifs, Stewart states that this model "...is different from a time line (such as clave and tresillo) in that it is not an exact pattern, but more of a loose organizing principle." Johnny Otis released the R&B mambo "Mambo Boogie" in January 1951, featuring congas, maracas, claves, and mambo saxophone guajeos in a blues progression. Ike Turner recorded "Cubano Jump" (1954) an electric guitar instrumental, which is built around several 2–3 clave figures, adopted from the mambo. The Hawketts, in "Mardi Gras Mambo" (1955) (featuring the vocals of a young Art Neville), make a clear reference to Perez Prado in their use of his trademark "Unhh!" in the break after the introduction. Ned Sublette states: "The electric blues cats were very well aware of Latin music, and there was definitely such a thing as rhumba blues; you can hear Muddy Waters and Howlin' Wolf playing it." He also cites Otis Rush, Ike Turner and Ray Charles, as R&B artists who employed this feel. The use of clave in R&B coincided with the growing dominance of the backbeat, and the rising popularity of Cuban music in the U.S. In a sense, clave can be distilled down to tresillo (three-side) answered by the backbeat (two-side). The "Bo Diddley beat" (1955) is perhaps the first