Power Play consists of a father, his two sons, and his nephew. Jack Slamka, the father, sings bass and is a 30-year member of the Barbershop Harmony Society. Michael, his son, sings lead and is a 20-year member of the Society. Some choruses are dedicated to devoting much of their time toward competition within the society. If you have seen any of the TV programs (especially on PBS) featuring barbershop…