The Penguin Cafe Orchestra are usually found in the new age section of the music store, but that's more out of default than anything else. They're not quite new age, classical, folk, jazz, you name it - but you know you like it. I definitely recommend their greatest hits CD, Preludes, Airs & Yodels, for good thinking music.
This, I thought, would be a good way to start a Sunday. It's "Music for a Found Harmonium," which you may recognize from Napoleon Dynamite (it's played on an acoustic after the big dance scene).