In the new issue of Prog Magazine, Bjørnson is the subject of the career-spanning The Prog Interview, in which he discusses how he got into music and his career in music developed. Naming his earliest influences as Pink Floyd (from his father's record collection), Kiss and UK metal band Venom, he also states that his deeper knowledge of progressive rock comes from none of other than Mayhem's Euronymous
Euronymus (real name Øystein Aarseth), co-founded controversial Norwegian black metal band Mayhem and also ran a record shop in Oslo named Helvete (Norwegian for 'hell') which a teenage Bjørnson and his fellow Enslaved founding member Grutle Kjellson would visit.
Euronymous was murdered by fellow musician and former band mate Varg Vikernes in 1993, who played bass on Mayhem's debut album De Mysteriis Dom Sathanas.
"Euronymous was the guy who showed me prog," explains Bjørnson. "He gave me Klaus Schulze’s Time Winds, Tangerine Dream, all this stuff I liked. It blew my mind, every second listening to those albums. I was 14 or 15 when we would go to his record shop Helvete in Oslo with a packed lunch on the bus.
"He was a mentor musically and as a guitarist. The single most important thing as a guitarist was his masterclass. He stopped by our house, he had his guitar, I kept asking him all the time how do you get that sound. We were listening to the demos and he decided to take the guitar and show me. Everything good shaped from that."