R&B originated in the 1940s as a replacement term for "race music" which was used to describe music of black origin. It is influenced by soul and gospel music and typically features piano, drum beats, saxophone, and backing vocalists. The migration of African Americans to northern cities in the U.S. opened new markets for R&B and artists like Jimmy Witherspoon and Louis Jordna dominated the charts in the late 1940s. Hip hop originated in the 1970s in the Bronx among gangs and was pioneered by figures like DJ Kool Herc who is credited with creating breakbeats and the idea of the DJ mix by looping sections of songs. It later spread worldwide and became a