Detroit descended upon California as Eminem made a triumphant return to the West Coast at the Epicenter 2010 Festival on Saturday. Marshall Mathers performed just before fellow Motor City mavens KISS, and what the rapper lacked in pyro he more than made up in fanfare. Still one of the biggest-selling artists in the world, Epicenter was one of only a handful of concerts Em put on in 2010. Cali happily welcomed Eminem back, roaring, dancing and rapping their approval. Epicenter's first of two days was marked by sweltering heat in the 100s and a handful...