Music for Macbeth - urgently need your help!

[semp]

I am a primary school teacher doing a performace of Macbeth. The RSC will be watching our performance and deciding if we can perform in the Globe theatre. We are performing tha part where Banqou is murdered and we have decided to perform his murder in slow motion but I need some dramatic piano music to play and I am struggling to find the best piece. Any help would be gratefully recieved!!

Many thanks
SEMP