5. D'Angelo: It's been a weird, sad road for D'Angelo. The Grammy winner hasn't been able to bounce back after the huge success of his debut and sophomore releases. He's had run-ins with the law, as well as drug and alcohol problems, to go with label issues. The recent appearance at Bonnaroo bodes well, but performing old material to an audience of devoted fans is far from the new album we've been anticipating now for 12 years. His third album, reportedly titled James River, was initially set for release in 2009.