The famous producer co-founded Def Jam Records with rap mogul Russell Simmons, helping to popularize hip hop music with the Beastie Boys, LL Cool J, Public Enemy, and Run-D.
J. (AP) New York City radio station Hot 97 celebrated its 20th annual Summer Jam concert with young rappers who are dominating the charts, a respected veteran hip-hop group and a slew of surprises.