Hatsune Miku, Virtual J-Pop Star, Performs on 'Late Show With David Letterman'

Hatsune Miku is a real fake pop star. Really. See, Miku is the creation of a software company. She's virtual. Her voice is digitized, using vocal samples from a Japanese voice actress named Saki Fujita, which can then be manipulated using a program called Vocaloid. As a result, there are…