It's not only rock and roll, after all. At the Rock and Roll Hall of Fame and Museum in Cleveland, Ohio, a new exhibit is honoring rap music. "Roots, Rhymes and Rage: The Hip-Hop Story" pays tribute to the contemporary art form, with an exhibit that traces its history, from breakdancing to graffiti art to record sampling. On display: lyrics by the late Tupac Shakur and a pair of Adidas sneakers by Run-D.M.C. The exhibit's assistant curator Craig Inciardi told the AP, "It's now an established part of the mainstream music industry."