I got quite a few instrumental songs I like. I'll just post one I listened to a lot when relaxing in a hot bath. Think of a sunny day in Venice and going on a slow gondola trip. http://www.youtube.com/watch?v=MFqh1kynWmY
On my phone so cant provide a link but Mahler's symphony number 9 is a favorite of mine.
Filled with tragedy, pathos, comedic irony, rage, and sadness.