R&B combines elements of gospel, jazz, and blues, creating a melodic style. The term was created in the 1940s to replace "race music" and described soul and funk artists like James Brown and Sly Stone by the 1970s. In the 2000s, R&B blended with hip-hop and it became harder to distinguish between the two based on vocals (sung for R&B, rapped for hip-hop). Common R&B lyrics revolve around everyday life themes like love, work, drinking, and sex.