Since taking over Capitol in late 2012, Barnett has renovated the company's iconic Hollywood tower, re-signed Paul McCartney and his catalog and sold 2.1 million digital tracks from Halsey -- all in a digital world the father of three once worried might kill the business. "We've come out the other side," says Barnett, a U.K.-born college dropout who previously held top Epic and Columbia posts. "When Migos' 'Bad and Boujee' is the No. 1 track in the iTunes Store, it tells you the public can speak. That's a good thing."