It's incredibly difficult to make a great rock biopic. How do you cram a person's entire life into a two-hour movie? Even more challenging, how can actors convincingly portray iconic musical figures? That probably explains why long-rumored movies about Keith Moon, Mötley Crüe and Janis Joplin never seem to get off the ground. The new James Brown movie Get on Up, however, was a rare success, and we asked our readers to vote for their other favorites. Click through to see the results.