List of bands (24):

Porcupine Tree
Power Paladin
Powerflo
Powerwolf
Primal Fear
Pro-Pain
proAge
Proletaryat
Prong
Psycroptic
Queensryche
Rage
Rage Against The Machine
Raging Speedhorn
Rammstein
Raven
Ravencrown
Red Hot Chili Peppers
Red Method
Retromorphosis