Music for writing?

I know a lot of fellow authors like to listen to music while they are writing, and I'm one of them, so I was just wondering what sort of music do you listen to?

Do you listen to music that fits the mood of what you are writing? I certainly do. If I have to write a high energy action scene, nothing like some hard rock to get the juices flowing and the energy to pour out into my words.

Do you listen to music that maybe your characters would listen to? I've never thought of this before, but it could work if you are working on a very personal and intimate scene.

What is on your writing playlist?

I listen to a wide variety, ranging from Aerosmith, to Classical Mozart and Beethoven.