Listening to classical music is really good for studying too. There's been a whole book written on the affects music has on the brain.
I play classical music or jazz while studying or reading in general. I can't really focus if theres singing in a language i utterly understand. It always distracts me. Italian, French, Latin or Spanish Singing in an opera or classical piece is ok. Most of the time it's just beautiful sound to me, even though i don't really understand what the lyrics are about. But i think the sound of a voice or instrument alone is enough to really grasp what a composition or opera wants to express.
To the guy who asked what i got: Just about everything by Bach, Beethoven, Mozart, and some CD's by the others i've recommended before. My father was Austrian and used to listen to a lot of classical music, so i grew up with that shit and i got all of my dads cds when he died.
I will try to upload some shit on Sunday or Monday, cause i gotta work tomorrow. If you want something particular, holla
3:00 am bumpin Ludwig Van Beethoven