Dr. Dre has tripled his net worth in the past few days. Last week news emerged that HTC was buying a 51 percent stake in the headphone company Dre co-owns with Interscope chief Jimmy Iovine for a startling $300 million, a deal that could eventually push the rapper's wealth north of half a billion according to Forbes' back-of-the-envelope calculations. Dr. Dre has been in the headphone business for less than four years, a little less than half the amount of time he's been working on his final album, Detox, due out next year. But Dr. Dre's not the only hip-hop artist inverting roles. The past few years have seen some of the industries biggest entertainers become wildly wealthy off of everything except actually entertaining people.

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