I think it's pretty funny when I get "In the Zone" when writing. I get so focused I completely forget that I was listening to music, and don't unpause it. I have no idea if it helps me or not, but I like listening to music, especially if it's got a good beat.
If you want to know, I'm listening to the entire FTL ost, A game which I actually referenced in one of my Fics. What's even better was I referenced a reference in the game that was referencing MLP. A total "Referenception".