Who wouldn't adore the opulent Vangelis qualities that make up the Blade Runner soundtrack?? :D
Definitely more low key music (by that I mean, less boom and more melodic fluidity and atmosphere) always worked when my brain required I buckle down in deep thought and study/write essays/do homework. One thing I never understood was how people felt they could study when the television was on. Too much of a distraction!
And Mozart - all those studies on improving brain function and all of that expose some truths about brain function and memory retention. There's all sorts of Mozart For Babies stuff out on the market and sure it's a money making scheme but at the same time you there's that old saying that music calms the savage beast. ;) I had a couple of teachers in high school that used to play Mozart or Beethoven (not the sweeping dramatic Beethoven but the more low key) softly during exams. Whether this had a marked improvement on test scores I don't know, but with the music playing people seemed to settle into exam mode quicker and I know for me having the music playing helped me focus more on the exam and less on distractions coming from outside the classroom, or my brain drifting off into la la land.
Another thing that comes to mind is when I was in college I took a number of art courses, lots of life drawing and such. Even when your output is more creative than academic, there's plenty of room for distraction so music helps keep things centered I think. One of the instructers I had used to play Dead Can Dance and This Mortal Coil. Something about the energy, atmosphere, instrumentation of those songs fit so well with what we were doing. It was those classes that introduced me to those bands, so it all worked out in the end.
Anyway, yeah. I didn't mean to type a freakin novel here.