There's a reason Dr. Dre's long-awaited album -- formerly titled Detox -- has yet to see the light of day. Actually, there are about 620 million reasons. That's the reported dollar amount that Dre. amassed in 2014, and it had nothing to do with the release of any new music, and almost everything to do with the sale of Beats Electronics to Apple for $3 billion. No one came out richer from that acquisition than the rapper-producer-turned-headphone mogul, whose $620 million annual payday was the most substantial amount for any musician in history. Second place for 2014? Beyonce, whose $115 million yearly earnings look stingy by comparison. Go to Forbes to check out the full list.