It is commonly known that music has a huge influence on your mood and concentration. Music helped Thomas Jefferson write the Declaration of Independence. When he could not figure out the right wording for a certain part, he would play his violin to help him. The music helped him get the words from his brain onto the paper. I know from experience that listening to a certain genre of music changes my gaming performance in niveau and style.
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Psytrance with heavy guitars as well as ambient sounds influence your gameplay the most. While with metal you play more aggressive and offensive, you play more defensive with epic soundscapes. From my experience I can tell I play with Incubus' album S.C.I.E.N.C.E. the best.
What's your favorite music to listen to while gaming? Tell me in the comments, I'm curious ;)