ROB PRINZ, 58
Partner/co-head of worldwide concerts, ICM Partners
MARK SIEGEL, 63
Partner/head of music, ICM Partners
Last Year's Rank: 68
A roster that includes Rae Sremmurd, whose "Black Beatles" spent seven weeks at No. 1, and Future, the fastest artist to have three albums top the Billboard 200 since 2010, as well as best new artist Grammy nominee Anderson .Paak and rising star Lil Yachty, have made ICM a leader in the rap and hip-hop space. "It's from clubs, to support on a major arena tour, then popping and headlining their own tours," says Siegel of the growth of Future and Yachty. "It's amazing how fast these artists happen."