Some years ago when I was doing my math-exercises until 3 a.m. I listened mostly to Midnight Oil(site uses flash, but there are links on the bottom), it was the right stuff to keep me awake.

(This happened once or twice a week on Wednesday (for the exercises that were due on Thursday) and on Thursday (for the Friday-exercises). I have to admit that I could have done them earlier but on other days I preferred to sleep. Usually I solved them first with pencil on paper and then wrote down the exact proofs after everything was ready.)

Now I prefer Vangelis (1492, The city, Mythodea), the soundtrack of Myst 3 (got it as MP3s on a CD in a magazine), the soundtrack of Diablo II (from Blizzards Site, my favourites are the tracks for Act 5), and Wolfsheim (Dreaming Apes and Spectators).

At work (university) there is only the sound of the old laser-printer (also a "good" ozone- and heat-source) and sometimes the birds