Talk about unbelievable collaborations! Legendary musicians David Crosby and Graham Nash have worked with Pink Floyd guitarist David Gilmour in the past, but their appearance at last night’s performance at the Royal Albert Hall was something totally unexpected. Sure enough, Crosby and Nash joined Gilmour for three songs last night, including “A Boat Lies Waiting”, “On An Island”, and the encore, “Comfortably Numb”.

Crosby and Nash were both involved with Gilmour’s two solo endeavors, including 2006’s On An Island and the recently-released Rattle That Lock. (Read the review here). You can check out their performance of “On An Island” below:

Check out the full setlist below. Gilmour returns to the Royal Albert Hall tonight and tomorrow night as well.