If you were in a movie, it would sound awesome. Outside of a movie, it would sound awful because of the fact that you were wearing large ether-proof gloves.
Assuming a microgravity environment (and an electric pickup, which doesn’t need air to make a signal), the lack of atmosphere and gravity would make the strings vibrate differently, and probably for a longer period. I would guess a lot more sustain and possibly slightly louder than expected…?
Sound can travel through space, space is not a total vacuum. Atoms of gas give the universe a atmosphere, albeit a very thin one. Since sound travels compressed so it would translate into the sound being undetectable to human ears. I would imagine it would sound really really quiet.