4) Dr. Dre (Net Worth: $700 Million)

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Dr. Dre has produced songs and albums for various artists like Eminem, Mary J. Blige and Eve. However, he owes his fortune to Beats by Dr. Dre headphones, which accounts for 65 percent of the premium headphone market. Dr. Dre got $620 million when Apple acquired Beats by Dr. Dre for $3 billion. He is now worth an estimated $700 million.