I used to sing barbershop quartet in high school, but I doubt I sound like that now.
When we go to the beach every summer, I always do "Thank God I'm A Country Boy" by John Denver. I think people are impressed simply by the fact that I know all the words and can keep up with the music! I've also been told I do a good Bee Gees/Andy Gibb impersonation.
I'd pay good money to see Riggs and JD doing "I Got You Babe"!