I just put on the radio and let it play. But back in 2003, I picked up this Mozart Effect thinking it would help me study better. Sure enough it has and never let me down and has some good selections. My only complaint is that the people performing the pieces aren’t what I would consider 'quality".
I learned that you can learn about composers but after that the real hard part comes, knowing which current conductors and orchestras are really good. Get that last part down and the world is yours! 