During Waters' The Wall Live tour, Robbie Wyckoff sang Gilmour's vocals, and Dave Kilminster performed the guitar solos, both of them atop the wall, as Gilmour has been in the original tour. During the performance of 12 May 2011 at the London O2 Arena, David Gilmour appeared as a guest during this song, and both sang the choruses and played guitar from the top of the wall, echoing the original Earls Court performances.[18] The song contains one of the show's most memorable moments, when at a specific point in the final guitar solo, Waters runs to the wall, pounding it with his fists, triggering an explosion of colour in the previously dark grey projections.
Roger Waters: Comfortably Numb Live O2 Arena (With David Gilmour)'s Main Cast