List of bands (25):

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