Some researchers at Columbia have an interesting proposition for you. MusicLab will let you download songs legally and for free if you just answer a few questions related to the songs. None of the bands are really huge though, so don’t go looking for the latest Radiohead album. But apparently they are going to use the data from the study to do scientific stuff, so think of it as a good deed for science at no cost to you. The worst thing that could happen is being exposed to some crappy music. But I’m sure there are some gems hidden in there as well.