Reggae music is a Jamaican style of music that has roots in African music and rhythm and blues, or early rock and roll. Reggae songs are usually about social issues, politics and the Rastafarian religion, an African religion that many Jamaicans follow. An early form of reggae was ska music. Ska is a faster, upbeat style of music that was influenced by the New Orleans rhythm and blues music heard on U.S. radio stations in Jamaica. Reggae music characteristics include offbeat syncopation, upstroke guitar strums and chanting lyrics. Bob Marley and the Wailers became a well-known reggae group in the 1970s. They helped to spread reggae music internationally.