Therion is a Swedish symphonic metal group created by its main composer Christofer Johnsson in 1987. Therion is one of the first bands who achieved a remarkable commercial success mixing heavy metal with orchestral sounds: Vovin, its best-selling album, has surpassed the 150 thousand copies in Europe.

This success has brought it one of the highest levels of popularity and influence in the media among the bands of it genre, to the point of being mentioned as "the most powerful band in the genre itself"; it’s known among the metal fans in Europe, as well as in Japan and Latin America.