I'm surprised their are Smiley regulars with hundreds of posts on this board who have never seen this footage until today. Its been on you tube for years.
I'm also surprised that THERE are Smiley regulars who think David Marks is a weak guitarist and Smiley regulars who DON'T KNOW THE DIFFERENCE between there, their, and they're.
I'm going to give JS the benefit of the doubt on this one. That is the easiest of all typos to make, especially online.
Now there is a fair assessment of the ubiquitous their, they're and there error.