SilverKey said:
The original cut of the scene didn't have this either and I don't know if it's possible, but maybe it's an idea to change the music into something more grim when we see more Jedi dying and the remaining ones are being surrounded? It might give the whole scene a bit more weight.
i did something similar to that: http://www.youtube.com/watch?v=UzH62Nkg7fI at about 6:25