As I'm sure most of you know, the first releases of Guitar Hero III on the Wii were released with Mono sound when Stereo was advertised on the box
Well, the good news for US gamers is that they can now request a replacement...
here
Unfortunately, no such service has been arranged for UK residents yet and Activision refused to comment on it. This is thought to be because only some of the UK copies had the missing surround sound...
Do expect some word on this is the near future though!