The members of Led Zeppelin have always felt an incredible sense of gratitude to former Atlantic Records president Ahmet Ertegun. In 1988, when he asked them to play at a massive concert celebrating the 40th anniversary of the label, they couldn't say no. This time around they invited John Bonham's son, Jason, to play drums. The group closed out the concert with a 30-minute set that featured "Kashmir," "Heartbreaker," "Whole Lotta Love," Misty Mountain Hop" and "Stairway to Heaven." This time, Jimmy Page was in tune and Robert Plant wasn't hoarse, but it was clear to everybody the spark wasn't quite there.