[3] In May 1984, pioneering extreme metal band Hellhammer dissolved, but two of its members, guitarist/vocalist Thomas Gabriel Fischer and bassist Martin Eric Ain, went on to form Celtic Frost in June and release their debut, Morbid Tales, in November of that same year.

This was followed by To Mega Therion in 1985, arguably their most influential record, which did not feature Ain on bass, but stand-in musician Dominic Steiner.

Six months later, Thomas Gabriel Fischer reformed the band with a new line-up, of which Ain was left out, and went on to record the widely derided Cold Lake in 1988.

Celtic Frost re-formed in 2001 and released the critically acclaimed Monotheist in 2006, before ultimately disbanding following frontman Tom Gabriel Fischer's departure in 2008.

Ain sang the lead vocals for the song "A Dying God Coming into Human Flesh" on Celtic Frost's final album, Monotheist.