If you have not already tried listening to Bon Iver, I really reccomend that you do so. The music is just so beautiful, relaxing and almost heartbreaking. The first song I ever heard was Skinny Love which has remained my favorite, but I can listen to the entire "For Emma, Forever Ago" album from start to finish and enjoy the whole thing. I have a huge crush on singer Justin Vernon. Of course I have to throw that in there, real mature I know.
No but seriously, give it a listen, especially when you just want to lay, drive around or whatever you want. It's a perfect soundtrack for a rainy day.