Ann and Nancy Wilson of Heart sing “Stairway to Heaven” to Led Zeppelin at the Kennedy Center Honors in 2012.
More on the performance, including why Robert Plant was likely crying during the performance, from On Stage Magazine:
Joining Ann and Nancy Wilson for the Kennedy Centre performance on drums was Jason Bonham, the son of the late Led Zeppelin drummer John Bonham. Hailed by many as the greatest rock drummer of all time, Bonham died in 1980 at 32 years of age from asphyxiation as a result of excessive alcohol intake. Upon his death, it was decided among the remaining members that Led Zeppelin would not continue on as an entity without him. Despite collaborations among the members and a few performances throughout the decades, Led Zeppelin has not toured or recorded any new material. But when the members have played, their choice of drummer has primarily been Jason. His resemblance to his dad is eerie: beard, bulky frame, pork pie hat, explosive playing style, etc. So having Jason participate in the climactic number of the evening was an apt choice for the Wilson sisters to make.