System of a Down singer Serj Tankian joined the remaining members of Audioslave in a tribute to Chris Cornell in Germany on Sunday.
It happened at a festival in Nürberg, Germany where Prophets of Rage and System were both performing. Tankian sang "Like a Stone" with Tom Morello, Tim Commerford and Brad Wilk. You can check out the fan-shot video on YouTube. (Rolling Stone)