Mats Levén is a Swedish singer. Some of his most notable collaborations have been with guitarist Yngwie Malmsteen, symphonic metallers Therion and doom metallers Candlemass. In 2011, due to family issues on the part of Firewind's lead singer Apollo, Levén was called in to substitute for the rest of their European tour. He also started touring with Trans-Siberian Orchestra in 2016. In 2019, he released his first solo album under the name Skyblood. In 2022, he became a member of Vandenberg which is led by the well known guitarist, Adrian Vandenberg.

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.