During the Iceland Airwaves festival last night in Reykjavík, Yoko Ono's Plastic Ono Band surprised the crowd by inviting tUnE-yArDs on stage, who performed a cover of Yoko Ono's "We're All Water". They were joined by Ono at the end of the performance, who turned to the crowd to praise frontwoman Merrill Garbus. "She's great, right?" Ono asked.
Below, watch video footage from the performance.
