The service is far from comprehensive, but they do have some good stuff.

For example:

Songs: Ohia, they have a substantial catalog. My favorites are Didn't It Rain, Lioness, and Magnolia Electric Co.

I've also been listening to David Bowie's Black Star obsessively. I think it's my favorite Bowie album since Lodger.

And for parents of small children, they have some Disney soundtracks that come in handy, like Frozen and Moana.