Singing Stars: The 22 Best Actor-Musicians
Glover wrote for 30 Rock before starring in Community, where he became a TV star. Since 2011, however, he's also been known as rapper Childish Gambino. His first album Camp was met with positive reviews, but it has already been outsold by the follow up Because the Internet.
J. Lo started as a Fly Girl dancer on In Living Color, and with a little luck she transformed that into a lengthy film and music career. She had several movies under her belt before her first music release; perhaps her starring role as singer Selena helped her realize the other half of her career. Her first five albums all achieved Platinum certification.