I'm writing to ask if anyone knows which company/'s has got the contract for the sound/lighting for the olympic games its murder to find so does anyone know??

There would appear to be some sites where this information is listed if you would click on the following search.

2008 Olympic Games Producers Lighting Sound - Google Search

I agree that it's hard to pin down the exact ones because there are so many people and companies who are involved in that enormous production.