My main instrument is actually my voice, but my secondary is Guitar. I also play Bass, some keys, a tiny teensy bit of drums and I also dabble in anything else I can get my hands on.
I have been known to be fairly good at Violin, Cello, Double Bass, Bugle, Trumpet and a couple of others when I first picked them up at college. That means I've been able to hold a tune first time around on all these things in little jam sessions. If a mic or Guitar weren't laying around then I would pick up the nearest thing in the music department and give it a shot, sometimes with pleasantly surprising results, lol. :lol: