engel

"Engel" (German for "Angel" or "Angels") is a song by German Industrial metal band Rammstein. It was released in April 1997 as the first single from their second album, Sehnsucht. The female part of song's chorus is sung by Christiane "Bobo" Hebold of the German pop band Bobo in White Wooden Houses. An English version of "Engel" can be found on US special editions of Sehnsucht.
According to an interview, keyboardist Christian Lorenz came up with the main riff for this song on a synthesizer along with a whistle melody.