31. LL Cool J, 'Radio'
Def Jam, 1985
L.L. Cool J was only 16 when he released his first single, "I Need a Beat." A year later, he had the first hit on the fledgling Def Jam label. The sound he and Rick Rubin found on "I Can't Live Without My Radio" and "Rock the Bells" was harder and leaner than hip-hop had ever been.