The Daily Grind: Music to grind by

It seems like no matter what game you spend time in, there's the inevitable grind. It's part and parcel of MMOs. To pass the hours spent in our favorite worlds, we like to listen to different things. Some of us really enjoy some bouncy EBM/techno to while away the time spent hunting for that one drop. Others can't imagine not having something harder going, with crunchy guitars and pounding drums to get the blood flowing. When it comes to your grind-time, what would you say is your absolute favorite music? Do you have a "desert island classic" album that you return to time and time again? Any songs or artists that just seem made for running around in the game you play in while you go farm up another stack of food or materials?