This begins with the reading of a section from Sir Gawain and the Green Knight, in the original Old English. It's always fascinating to listen to Old English read aloud: it's almost intelligible, but -- without training and study -- just beyond comprehension. Middle English often is comprehensible if read aloud, but our modern language depends so much on the French influence from the Norman period that the Old English escapes us.
You can get a closer look at some of those beautiful manuscripts at the exhibition's website. If you happen to be in Oxford, the exhibition is free to attend; but alas, I imagine I will not be able to go.