Delerium is a Canadian new-age ambient electronic musical duo that formed in 1987, originally as a side project of the influential industrial music act Front Line Assembly. Throughout the band's history, their musical style has encompassed a broad range, including dark ethereal ambient trance, voiceless industrial soundscapes, and electronic pop music. They are best known for their worldwide hit "Silence". The band is known to feature female guest vocalists on their albums since their 1994 album Semantic Spaces.