[Album] What's the name of that song?

Okay, I have one that's been bugging me -- but I don't think anyone outside of the Concert Hall will probably know it.

If you can recall the "Got Milk?" ads within the last two years, there was one that just had pictures of X-rays on the screen, coupled with a classical piece that sounded like a clarinet solo. I *loved* that solo (it could have been oboe, but I'm pretty sure it was clarinet), and I would like to know if it was a concerto movement or just a solo part in a larger piece.

I may or may not feel stupid about not knowing this...commercials tend to use rather overused, famous classical pieces. I probably should know this. But I don't.

Jam it back in, in the dark.