No contest (and everyone's going to post this):

God save the Queen:

http://www.youtube.com/watch?v=AwziS2aE6Ww

Rule Britannia:

http://www.youtube.com/watch?v=m97xHboTSi8

Land of Hope and Glory (Takes a while to get going):

http://www.youtube.com/watch?v=oONWgcvPutE

And...

http://www.youtube.com/watch?v=8z2M_hpoPwk