His role in the group is as a guitarist and composer, but he also plays keyboard, vibraphone, and bass guitar, plus he provides some backing vocals. Peter uses a variety of guitars but his favorite guitars nowadays are a Fender Jazzmaster, Gibson Les Paul, Fender '62 Telecaster Custom and an Epiphone Crestwood. In the past he also used a Gibson Les Paul Custom and a '52 Telecaster. He is endorsed by Line6 and uses a Vetta II head straight to the monitoring and PA systems.
His earlier musical experience included a few hard rock bands in his early teens. After that, it consisted of playing with a couple of bands with Magnus Sveningsson, a few years before The Cardigans formed. He started The Cardigans with Sveningsson in October 1992.
He has a sister, and lists his other interests as "anything musical".