Rapping included greetings to friends and enemies, exhortations to dance and colorful, often humorous boasts. By the beginning of the 1980s, there had been popular hip hop songs like "Rappers Delight" by the Sugarhill Gang and a few major celebrities of the scene, like LL Cool J and Kurtis Blow. Other performers experimented with politicized lyrics and social awareness, while others performed fusions with jazz, heavy metal, techno, funk and soul. Hip hop began to diversify in the latter part of the 1980s. New styles appeared, like alternative hip hop and the closely related jazz rap fusion, pioneered by rappers like De La Soul and Guru. The crews Public Enemy and N.W.A did the most during this era to bring hip hop to national attention; the former did so with incendiary and politically charged lyrics, while the latter became the first prominent example of gangsta rap.