Jan Axel Blomberg, better known by his stage name Hellhammer, is a Norwegian drummer known for his role as the drummer of the black metal band Mayhem, which he joined in 1988. He is the only member to have appeared on all of their studio albums. In 1987, Blomberg, alongside Steinar Sverd Johnsen and Marius Vold, formed the avant-garde black metal band Arcturus, which disbanded in April 2007 and reunited in 2011. He adopted his stage name in homage to the Swiss extreme metal band Hellhammer. Acclaimed as a talented musician, Blomberg is a three-time recipient of the Spellemannprisen award.