Actually, I think this could work really well. You just need a battery powered 360, a small TV and your copy of Guitar Hero II. Look it's a great idea. Fortunes could be made here, trust me on this.
It's not as if there isn't a precedent set already set: one of the world’s leading Guitar Hero experts, Luke Albigés, performed the original game at a busking session in Leicester Square Underground station.
So go get your 360 mobile and hit some power chords on the street!