List of bands (24):

Pearl Jam
Periphery
Phil Campbell and the Bastard Sons
Phobocosm
Polaris
Pop Evil
Porcupine Tree
Power Paladin
Powerflo
Powerwolf
Primal Fear
Pro-Pain
proAge
Proletaryat
Prong
Psycroptic
Queensryche
Rage
Rage Against The Machine
Raging Speedhorn