I'm definitely from another generation than most 'ballers here but my pump-up music is:
Gangsta - especially Mystikal's Here I Go
Santana - from 1968 to now, especially the more rythmic stuff like Se a Cabo, Incident at Neshabur, Toussaint L'Ouverture and Jingo.
Jimi Hendrix - Purple Haze, Voodoo Child, All Along the Watchtower
Jethro Tull - Locomotive Breath
Doors - Break on Through, The End
Then there are the clichés:
Strauss - Also Sprach Zaruthustra (sp?)
and, guess what, Wagner - Ride of the Valkyries and others from Das Ring Der Nibelungen.