E Nomine is a German musical project, formed in 1999, by producers Christian Weller and Friedrich Graner. Their music is an unusual combination of trance/techno and vocals which closely resemble Gregorian singing and chanting. Other vocals are performed by German synchronis speakers; such as long-time collaborators Christian Brückner and Rolf Schult.
Source: http://artists.letssingit.com/e-nomine-5gw3v/biography
