R&B, noma i-Rhythm and Blues, iwuhlobo lomculo oluthandwa kakhulu olwalukhula phakathi neminyaka yama-1940s e-United States. Luhlobo lomculo oluhlanganisa izici ze-jazz, gospel, nempembelelo ye-blues, futhi lubonakala ngezinto ezifana ne-strong backbeat, i-lyrics ezizwela inhliziyo, nezwi elinamandla. I-R&B yaziwa ngokugxila kwalo emicabangweni yothando, ubuhlungu, nempilo yonke yansuku zonke. Lolu hlobo lwezomculo lube nomthelela omkhulu ekwakhiweni kwezinye izinhlobo zomculo ezifana ne-rock, soul, kanye ne-hip-hop. Namuhla, i-R&B ihlanganisa izitayela zesimanjemanje nezendabuko, ihlangene nezici ze-pop ne-hip-hop, okuyenza ibe yinto ehambisana nezizukulwane ezintsha.