List of bands (24):

Orbital Damage
Otherwise
Out Of Bounds
Overkill
Ozzy Osbourne
P.O.D.
Papa Roach
Paradise Lost
Parallyx
Paralydium
Parastate
Parkway Drive
Pearl Jam
Periphery
Phil Campbell and the Bastard Sons
Phobocosm
Polaris
Pop Evil
Porcupine Tree
Power Paladin