If I were able to play the guitar with great skill, I would play either Hazard by Richard Marx or Joy to the World by Three Dog Night. Not conventional choices, but both are great songs. Hazard is a good choice because its one of those songs that tells a story. Joy to the World is on of those tunes that you can’t help but get up to dance and sing. I love music like that.
So guess what, I wouldn’t play just one song! If I could all of a sudden play the guitar I would play for days.