Dan-Erland Swanö, also known as Dan "The Man" Swanö, is a Swedish musician and record producer who is currently the vocalist, guitarist, ex-bassist and ex-drummer for the band Nightingale, lately vocalist, keyboardist and drummer for the band Witherscape, as well as the owner of Unisound, but he achieved fame as the vocalist and songwriter of progressive death metal band Edge of Sanity.

Therion is a Swedish symphonic metal band founded by Christofer Johnsson in 1987. Its name was inspired by the Celtic Frost album To Mega Therion. "To Mega Therion" is Greek for "The Great Beast" and was a title used by occultist Aleister Crowley. Originally a death metal band, Therion adjusted its musical style by adding orchestral elements, including choirs, classical musicians, and even a full orchestra at their concert performances. As a result, they are considered pioneers of the symphonic metal genre.