I'm not sure if I'm being helpful by not recommending individual songs, but at least I'm trying.
What I suggest is the Ori and the Blind Forest OST. It's mostly rather relaxing and atmospheric, and really beautiful to listen to. I burned it on a CD and now listen to it while driving, and it's great. For studying, I imagine it'll be even better.
Of course you're being helpful!
@thread thank you for all the suggestions - I'll start getting some preliminary work on it done