Japan's newest singing sensation is a... Hologram. Really. They are actually selling tickets to projector concerts using a live band to accompany a virtual performers like Hatsune Miku. Regardless of being a Hatsune Miku fan or not, just seeing what technology can accomplish is pretty astonishing.
Miku's voice comes from Yamaha's Vocaloid synthesizing technology and is formed from a real person's voice, Japanese actress (but not singer) Saki Fujita. So it can't really do everything.