Art: Vocaloid, Hatsune Miku
Hatsune Miku (初音ミク) is a 16-years-old girl character representing a singing vocal synthesizer Vocaloid, developed by Yamaha.
Vocal synthesizer is a machine that generate singing human voice. So, it'll sing any song, eventually, as perfect or better than human singers.
Her singing sounds terrible.
There's sci-fi anime story Macross Plus, where a computer AI produced female entertainer named Sharon Apple, represented as a hologram, became a galactic pop idol. Miku Hatsune is a real-life version of Sharon Apple. See: Sharon Apple - Information High (Macross Plus).
Thanks to Gwern Branwen http://www.gwern.net/, [2012-01-07 wizardgynoid ] ( https://twitter.com/wizardgynoid ) for tips.