Rhythm and Blues stemmed from the jazz music of the 1940's and it came to be a term for blues music that was slightly more upbeat. Rhythm and Blues of the fifties combined jazz, doo-wop, blues, and gospel to create a unique sound during the decade. It also sparked the creation of such genres as Rock 'n' Roll, soul, Motown, and funk music. Many R&B artists of the decade were originators of rock music and a lot of the songs that came out of the fifties in the rhythm and blues genre are one in the same with the rock 'n' roll genre. A lot of the most popular songs of rock music enjoyed time on the R&B charts during the decade. Many African-American musicians who created rock music were somewhat pushed into the category of R&B artists by music producers. This genre is largely populated by African-American musicians with many white artists and musical groups covering the original material and turning R&B songs into traditional pop songs with a more mainstream sound (like the Chordettes and the Crew-Cuts). Some of the most notable R&B artists of the decade include Frankie Lymon and the Teenagers, Sam Cooke, The Drifters, The Platters, Ray Charles and Lloyd Price.