Peter Tanner started out with such bands as "Bloody Six", "Headhunter" and "Witchcraft" before joining Fernando Von Arb and Co. on vocals. He was the first singer since the departure of vocalist Marc Storace and recorded with KROKUS 1990's "Stampede" album.

In 2000 Peter Tanner is part of a side project that produced the CD "DC World". It is a homage to AC/DC and features on the majority of the songs on vocals Marc Storace, singing the parts of deceased AC/DC singer Bon Scott and Peter Tanner the parts of Brian Johnson. Two former KROKUS members, bassist Tony Castell and guitarist Dominique Favez are also part of that project.