In 2008, he did guest vocals for the track "Guardians of Asgaard" on Amon Amarth's album Twilight of the Thunder God.
They recorded a three-song demo, produced by famous producer Dan Swanö and with backing vocals by Lars Göran Petrov.
Lars von Trier | Lars Ulrich | Sven-Göran Eriksson | MC Lars | Lars Forssell | Lars Danielsson | Ilf and Petrov | Lars Saabye Christensen | Lars Løkke Rasmussen | Lars Levi Laestadius | Lars Bystøl | Goran Bregović | Lars Onsager | Goran Bregovic | Vladimir Nikolayevich Petrov | Lars Winnerbäck | Lars Petrus | Lars-Olof Mattsson | Lars Norén | Lars Lindberg Christensen | Lars Lilholt | Lars Leksell | Lars Larson | Lars Knutzon | Lars Jonson Haukaness | Lars Hirschfeld | Lars Gullin | Lars Frölander | Göran Therborn | Göran Sonnevi |