Lil Jon, known as the King of Crunk, has numerous business interests. Once you get popular, you have a brand, he says. You have to market that brand. (Frazer Harrison / Getty Images)
The Three 6 Mafia performs Its Hard Out Here for a Pimp during the 2006 Academy Awards show. Three 6 is one of the hip-hop groups that play in the ring tone business. (Mark Boster / LAT)
Hip-hop star Jordon Houston, also known as Juicy J, arrives at the Kodak Theatre for the Oscars. (Beatrice de Gea / LAT)
Lil Jon of Lil Jon and The East Side Boyz have popularized the hip-hop genre known as crunk. (Myung J. Chun / LAT)
