PC version Fans have made a PC version. Some are still early, so read the project page first.
Fans took Guitar Hero: Warriors of Rock apart and rebuilt it so it runs natively on a computer, often with widescreen, higher frame rates and mods. Here are the 2 projects we know about:
Quality of life improvement mod for GH:WoR
Native recompilation of Guitar Hero: Warriors of Rock (Xbox 360) for PC