Rhythm and blues (R&B or RnB) is a genre of African-American music originated in the 1940s. The term was originally used by record companies to describe recordings marketed predominantly to urban African-Americans, identical to urbane, rocking,jazz based music with a heavy, insistent beat. The bands usually consisted of piano, one or two guitars, bass, drums, saxophone, and sometimes background vocalists. R&B lyrical themes often tell about the African-American experience of pain and the quest for freedom and joy. By the 1970s, the term rhythm and blues changed again and was used as a blanket term for soul and funk. In the 1980s, a newer style of R&B developed, becoming known as “Contemporary RnB”. It combines elements of rhythm and blues, soul, funk, hip hop, and dance.
While, Hip hop music, also called as rap music, is a music genre developed in the US by African-Americans in the 1970s which consists of a stylized rhythmic music that commonly accompanies rapping. It developed as part of hip hop culture, including four key stylistic elements: MC/Rap, DJ, Break Dance, and Graffiti Writing.