Here's the young French group Quatuor Ebène playing the slow movement of Debussy's Quartet, from an outstanding Virgin Classics release:
Steve Smith has been using this imeem gadget on his blog. I don't love the look of the thing, and I don't like having ads pop up on my site, but it's a good way to spread music.
The Ebène, who are touring America in March, also flirt with pop; on YouTube you can watch them playing "Misirlou."