Celtic Frost were a Swiss extreme metal band from Zürich. They are known for their strong influence on the development of extreme metal and avant-garde metal.
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Formed in 1981 as Hellhammer, the band evolved to become Celtic Frost in 1984 and released their debut, Morbid Tales, that year. This was followed by To Mega Therion (1985) and the highly experimental Into the Pandemonium (1987), all of which were widely praised. After the release of Vanity/Nemesis (1990), the group disbanded.
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It re-formed in 2001 and released the critically acclaimed Monotheist (2006), before disbanding following frontman Tom Gabriel Fischer's departure in 2008.