I have some Metal songs here. Also, Rap sucks for pking music, so I don't recommend it at all. You can put techno. Tiesto is really good techno.
Mudvayne: Dig, imn.
System of a Down: P.L.U.C.K., B.Y.O.B, Chop Suey, Radio/Video, Bubbles.
Lamb of God: Laid to Rest(highly recommended, this song owns), Omerta, Walk with me in Hell, Redneck.
Slipknot: Sic, Spit it Out, Surfacing(lots of cursing), Pulse of the Maggots, Eeyore.
Dethklok: Thunderhorse, Blood Ocean, Go forth and Die.
Metallica: Enter Sandman. Metallica is old Metal but they're okay.