During the 1980s Switzerland produced a number of metal bands. A Swiss band, Celtic Frost, mostly known for their progression of style and avant-garde take on extreme music started in the early 1980s as Hellhammer and soon became a leading heavy metal band in Switzerland. They together with a few other bands laid the foundation of modern metal in Switzerland. Related to Celtic Frost is the technical thrash metal trio Coroner who were roadies for Celtic Frost. The late 1980s saw black metal band Samael being formed which converted into an industrial metal band.