Per had been touring as a drummer since he was 13, and started working as a session musician in 1978. The following year he became a member of Janne Schaffer’s band Hörselmat, and it was probably through Janne’s recommendation that he ended up on the Super Trouper session.
A highly regarded drummer ever since, Per ended up playing drums on two tracks on ABBA’s last album The Visitors (Soldiers and the title track) in 1981. With the exception of The Day Before You Came, he was the only drummer used on the last group recordings in 1982. Together with Rutger Gunnarsson and Lasse Wellander, he also formed the core unit of musicians used by Björn and Benny on the Chess concept album, the two Gemini albums, and the Josefin Nilsson album Shapes.