“We have four rules we tell the audience at the beginning of every show,” according to Andy Hladek, one-half of the Bill and Andy Show. “First rule is singing along is encouraged. The second rule is dancing is encouraged. The third rule – we take requests. And last, the more you drink, the better we sound.”

Forty years ago, Bill Hadam and Andy Hladek were in rival bands. Then one night 20 years ago, Hadam found himself playing a solo gig and invited his former competition to join him on the…