Dr. Dre, or Andre Romelle Young, earned $110 million in the last year, Forbes said, mostly through Beats by Dre. In Aug. 2011, HTC Corp. bought a 51 percent stake in Beat Electronics LLC for $300 million, yielding the co-founder $100 million. "He set a trend that headphones are the new clothing line," said Forbes' Zack O'Malley Greenburg, author of the Jay-Z bio, "Empire State of Mind." ( Jeff Kravitz/FilmMagic/Getty Images)