What was the Rammstein song where a woman sings in the background?

The Rammstein song featuring a woman singing in the background is "Engel." In this track, the haunting vocals of the female singer add a contrasting layer to the band's heavy sound. The song, which translates to "Angel," explores themes of mortality and the afterlife. It became one of Rammstein's most popular songs, showcasing their unique blend of industrial metal and lyrical depth.