I have a collection of music that I hang on to for such purposes. I prefer instrumental music, so that there are no human voices to distract. Since I am a drummer as well, I try to find instrumental music without a prominent backbeat - otherwise I'll start tapping on the desk and performing other feats of air-drumming.

In your case, those 'new-age' compositions of naturual sounds might be a winner. Anything that will block out the distracting sound waves without being blocking itself should do the trick.

Good luck with your quest for quietness - a clear mind is the most important tool a programmer can have.

Jeff