Is the theme song copyright

[I Eat Doorknobs]

I wanna upload a video to youtube but the main theme song that play over the loading screen is in it (For about 40 seconds) so I wanna know if I can use it or not

[Maviba]

It's copyright, but rights of the main theme belong to R*.
They probably won't strike you, if it's used for GTA4 related stuff only.

However, don't use radio songs in you video. Those are copyrighted by others.