I've always listened to music while studying, especially calculus or any other kind of math since it's too boring to concentrate on sans background noise.
It's usually smokething calming/mellow or conversely electronic. Noise pop works sometimes too. Mogwai, The Album Leaf (which was my chemistry cd for the longest time), American Analog Set, Radiohead, Tortoise, sometimes BSS are the more mellow stuff. Sometimes when my concentration's really high I put on Jawbreaker, Modest Mouse, Slint or Neutral Milk Hotel.
More dance music would be groups/people like The Chemical Brothers, The Go! Team, Kid Koala, DJ Shadow, Fischerspooner, Royksopp.