During a performance at the Royal Albert Hall in London earlier this week, Pink Floyd’s David Gilmour surprised fans with a special guest: Benedict Cumberbatch, star of Sherlock, The Imitation Game, and the upcoming Marvel title Doctor Strange.

But Cumberbatch wasn’t just there to hang out and enjoy the show. He was there to sing. After Gilmour began playing “Comfortably Numb,” the actor took the center stage spotlight to sing Roger Waters’ parts of the song.

You can see a video of Cumberbatch singing with Gilmour here below.