He also played the sax on T-Rex's Bang A Gong
edit: Oops. I should have referenced some King Crimson as well. It starts rocking at about 5:30 if that is what you are looking for. For anyone that is wondering Tony Levin is playing what is called a Chapman Stick, it kind of a bass and a guitar on one fret board.
If you're going to make a post about Ian McDonald, why not reference some King Crimson that he actually played on?
Does the second video posted not show up for you?
Yeah, I just meant that he didn't play on that stuff, just their first album. The 80s King Crimson is a completely different incarnation, they might as well be a different band (not to say that it isn't great).
You're right. I went looking for some live music and then apparently forgot about what I was actually looking for!