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Listen to David Hyman and you're likely to make money--or at least improve the audio on your headphones. Among investors in Hyman's new digital music service, Mog, are Scott Jones, the inventor of voice mail, and Stephen Simon, who heads the equity arm of the largest publicly traded real estate company in the U.S. "David is a visionary," says Simon. "He has insight into this business no one else has." The musician and producer Quincy Jones is a Hyman admirer; so is Jimmy Iovine, the chairman of Interscope Records. Iovine recently asked Hyman to weigh in on a pair of high-end headphones he was designing called "Beats by Dr. Dre." Hyman tested their fidelity and made suggestions on the color scheme, with which Iovine agreed.