Seventh Tree is like a softer expansion of the sounds and themes of Felt Mountain. It's so pretty. The two middle Albums are pretty much glam-rock meets club music. (I prefer the first and most recent).
I find them to be a very diverse and satisfying act and far from background music, as I've lately been playing their pop/rock stuff in the car and their folk stuff at bedtime. Their melodies are gorgeous and their songs are overflowing with hooks.
In honor of summer:
http://www.youtube.com/watch?v=zBzYG6Nz8D8