I'm looking to buy a bunch of soundtracks for this game. Only for songs that actually play in the game as part of the content. If it's only a music roll, I don't care about it.

I've noticed there are a LOT of soundtracks available, and many of them seem to have the exact same songs as other soundtracks.

My question to you all is this: Which soundtracks should I buy that contain only music heard in the game itself, to get as many songs as possible with as few repeats as possible?