Hip-hop festival entrepreneur Chang Weisberg launched Guerilla Union in 2004 and expanded it into a touring festival in 2007. Today, the independent promoter and entrepreneur is shifting gears to "full mode": He's just six weeks away from the start of the 2013 Rock the Bells Festival. The venerable hip-hop franchise rings in its 10th year with stops in Los Angeles; San Francisco; Washington, D.C.; and New York this fall. Among the "bells" and whistles: performances by Wu-Tang Clan, Kid Cudi, Kendrick Lamar and Black Hippy, and J.

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