Hatsune Miku live in concert

Woahh!!! I have never seen this before! This is amazing!
Hatsune Miku isn't a real person, it's a vocaloid. Vocaloid is a singing synthesizer application software that enables users to synthesize singing by just typing in lyrics and melody. (YES I copypasted this from wikipedia!! ;D)
Now she had her own concert! :D Please watch the vid above!