Therion is a Swedish symphonic metal band founded by Christofer Johnsson in 1987. The word 'therion' comes from the Greek therion (θηρίον), meaning 'Beast,' i.e., that of the Christian Book of Revelation. However, the band's name is a homage to the Celtic Frost album To Mega Therion. Beginning as a death metal band, they later turned to combining orchestral elements with their metal music, employing heavy use of choirs and classical musicians, not only as additions to but also as integral parts of the composition. Therion is the first metal band with fully live orchestra featured. It is also the band which originated, popularised and influenced the symphonic metal genre, cited as 'the most adventurous metal band at present'. Because of these extents they take in conducting their music, they have been dubbed as 'Opera Metal'.
In spite of his numerous academic appointments Robin Orr steadily produced a sizeable output including three operas, three symphonies and a good deal of vocal and instrumental music. It all undoubtedly deserves to be better known though it really never lacked for performances. Very little of Orr's music has been available on records. His Symphony in One Movement (actually his first symphony) was recorded many years ago (EMI ASD 2279 - nla). This comparative neglect makes the present release the more welcome in that it not only pays a well-deserved tribute to the composer on his ninetieth birthday but also provides an excellent introduction to his varied output.