So will DVD-A have 5 or 6 channel audio as opposed to the normal stereo?

I'm not too up on audio technology, so please forgive me, but is there such thing as a surround sound or 5.1 audio CD?

If they get to 5 or 6 channel CDs, what would be carried in the so many channels? With movies, you are in a surrounded environment where stuff like planes fly around and behind you, but music (e.g. listening to a band at a concert) is typically in front of you.

Any explanation would be appreciated.

Thanks,
Roland