29. Heart (2013)
Ann and Nancy Wilson of Heart initially had no desire to reunite with the group's original lineup. They hadn't played with those guys in decades and there was a long and bitter history. In the end, they compromised by playing "Crazy on You" with the old lineup and "Barracuda" with the new band. It was the first time the group played together in 34 years, and it's hard to imagine a scenario where it happens again. Like many things at the Rock and Roll Hall of Fame, it was a one-time deal.