for me, depends on the scenario as i have multiple pumping songs. for going to clubs, i like Michael Jackson's "Off The Wall", Kool and the Gang's "Ladies Night", Pendulum's "Slam" and Dizzee Rascal's "Bonkers", "Dance Wiv Me" and "Dirtee Cash".
when playing my bass, some good ones that get me going and into it are Blink 182' "I Won't Be Home For Christmas", Judas Priets's "Painkiller" and Helloween's "Eagle Fly Free" (despite the fact i can't play all of it lol)
And what shoulder, & what art. Could twist the sinews of thy heart?
And when thy heart began to beat, What dread hand? & what dread feet?
What the hammer? what the chain? In what furnace was thy brain?
What the anvil? what dread grasp, Dare its deadly terrors clasp?
When the stars threw down their spears, And watered heaven with their tears,
Did he smile his work to see? Did he who made the Lamb make thee?
I have a couple of songs in general and one or two for 40k (but I cannot for the life of me remember the names of said songs) but, most of the time, anything by Britney Spears. I find her music to be incredible (much like her). I can put on any song by Britney and in put's me in the right frame of mind and the right attitude for whatever. One of the things I enjoy is seeing my opponents despair as I crush them to the tune of 'Oops...I Did It Again'.