like "Yakety Yak" (1958), both of which ranked among the most successful rock and roll acts of the era. Towards the end of the decade there were increasing numbers Italian-American singers taking up doo wop, creating groups like the Mystics and Dion and the Belmonts, and racially integrated groups like the Del-Vikings and the Impalas soon emerged. Doo-wop would be a major influence on vocal surf music, soul and early Merseybeat, including the Beatles. Cover versions Many of the earliest white rock and roll hits were covers or partial re-writes of earlier black rhythm and blues or blues songs. Through the late 1940s and early 1950s, R&B music had been gaining a stronger beat and a wilder style, with artists such as Fats Domino and Johnny Otis speeding up the tempos and increasing the backbeat to great popularity on the juke joint circuit. Before the efforts of Freed and others, black music was taboo on many white-owned radio outlets, but artists and producers quickly recognized the potential of rock and roll. Some of Presley's early recordings were covers of black rhythm and blues or blues songs, such as "That's All Right" (a countrified arrangement of a blues number), "Baby Let's Play House", "Lawdy Miss Clawdy", and "Hound Dog". The racial lines, however, are rather more clouded by the fact that some of these R&B songs originally recorded by black artists had been written by white songwriters, such as the team of Jerry Leiber and Mike Stoller. Songwriting credits were often unreliable; many publishers, record executives, and even managers (both white and black) would insert their name as a composer in order to collect royalty checks. Covers were customary in the music industry at the time; it was made particularly easy by the compulsory license provision of United States copyright law (still in effect). One of the first relevant successful covers was Wynonie Harris's transformation of Roy Brown's 1947 original jump blues hit "Good Rocking Tonight" into a more showy rocker and the Louis Prima rocker "Oh Babe" in 1950, as well as Amos Milburn's cover of what may have been the first white rock and roll record, Hardrock Gunter's "Birmingham Bounce" in 1949. The most notable trend, however, was white pop covers of black R&B numbers. The more familiar sound of these covers may have been more palatable to white audiences, there may have been an element of prejudice, but