When you have to study or get work done, what music (if any) do you put on to help you concentrate?

You know, it's the oddest thing. I can't have music on when I study. I find it far too distracting. I can easily ignore speech - so TV and films are okay - but I cannot ignore a song. I can, however, study in public - at a coffee shop for example - with all that noise.

I cannot ignore music. It's impossible.