e singers such as Elvis Presley and Carl Perkins ,who drew mainly on the country roots of the music.?Many other popular rock and roll singers of the time came out of the black rhythm and blues tradition.? For a few years it became the mercially essful form of rock and roll.Р8РDoo wopРDoo wop was one of the most popular forms of 1950s rock and roll, with an emphasis on multi-part vocal harmonies and meaningless backing lyrics , which were usually supported with light instrumentation.Р9РCover versionsРCovers were customary in the music industry in the 1950s.?One of the first relevant (有关的) essful covers was Wynonie Harris's transformation of Roy Brown's .?The most notable trend was white pop covers of black R&B .?Besides, The cover versions were not necessarily straightforward imitations.Р10
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