I don't have the studies readily available, however as an educator, I can say that it doesn't matter if you do/do not listen to music when you study. What is important is the congruency of the state in which you are being examined as compared to the state in which you studied. If you listen to music when you study, you should listen to it when you test (preferably the same music) and vice versa. I make an attempt to cater to my students when appropriate, but the bottom line is that no one can agree on what music to listen to while testing. Furthermore, iPods are out of the question because of school rules and the obvious cheating implications. Since most testing environments will be quiet affairs, I suggest you study with as little noise interference as possible. Like I said, I don't have the names and authors of the studies, but this information was relayed to me by a chem professor in undergrad and it stuck with me.