The Muscular Dystrophy Telethon on Labor Day weekend (now called the "M.D.A. Show of Strength"), has always been in my opinion, a 'must see event'. This year there's even more of a reason to watch the show. Country music Superstars Carrie Underwood, Tim McGraw and Luke Bryan are scheduled to appear on the Show of Strength. Check out who else is on the line up this year.