As well as the Jeremiah Clarke piece of music was one from Wagner's opera Lohengrin.
Here's the complete opera (in German):
As it's over 3 and a half hours long, I suggest listening to:
the opening prelude to Act 1 which is at the beginning as it's a beautiful piece of music
the opening prelude to Act 3 (2 hours 28 minutes in) which is another well known piece of music which is immediately followed
the most famous piece Wagner wrote (you might not have known it was by him and although his Ride of the Valkeries is as famous this piece has been played far more often)