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It's not a "hologram"' it's just a projection. You have to be reasonably close to the projection axis for this to be convincing, too.

In Japan, this has been taken further. No live performers at all. Here's a Vocaloid concert:

http://www.youtube.com/watch?v=dhYaX01NOfA

Both the image and singing in that video are entirely synthesized. Rock stars are headed for the unemployment office.

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Hatsune Miku is also a projection, not a hologram. But I think it's "further" than you think, because every single song at the concert is created by a musician or team that releases the song online for free. The extremely popular ones are put into the concert, as a way of saying thanks by the company who makes the voice synthesizing software to the fans.

Miku is likely part of my dissertation; extremely outdated research page here: http://alexleavitt.com/vocaloid

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