KALAMAZOO, Mich. (AP) — Michigan residents will soon be able to rock out with the National Guitar Museum as its traveling exhibit visits the Kalamazoo Valley Museum. "GUITAR: The Instrument That Rocked The World" opens Saturday in the downtown museum. The exhibit is broken into three parts: the science of sound; the evolution, engineering and design of the guitar; and the instrument's cultural impact. The exhibit will feature over 70 guitars as well as interactive displays.