At 4:45, following the Spiral Dance (which, by the way The Boy has already agreed to partake in) Estampie will be performing. They are a German medieval band, known well for their skill with ancient instruments without electronic amplification. I was able to find multiple video's of them on You Tube, and if you like this one, go ahead and click on the link and you can watch more.
Their site can be found here. And their myspace is here. The site is in German though (at least, I assume it's German, since they happen to be a German band), and their myspace is as well. Below are some music clips with you may also enjoy.