Returning to Sweden he joined Billionaires Boys Club, where his future HammerFall bandmate, Anders Johansson, played drums.
The band also featured ex-Accept guitarist Jörg Fischer and Yngwie Malmsteen's onetime vocalists Mark Boals and Göran Edman.
The group consisted of producer/composer Stefan "Big Swede" Svensson, Andy LaRocque, Reeves Gabrels and Nils K. Rue.
[7] In 2017, he also joined Spanish band Avalanch[8] Rosén also played with Joe Lynn Turner in 2017 on a Scandinavian tour.
[9] Rosén is also a member of The Senior Management, featuring Göran Edman, Henrik Zetterlund and Dennis Heltorp.