Serj Tankian joins Prophets of Rage to Perform 'Like a Stone' for Chris CornellSerj Tankian joins Prophets of Rage to Perform 'Like a Stone' for Chris CornellSystem of a Down vocalist Serj Tankian joined Prophets of Rage, which includes the three remaining members of Audioslave, to perform 'Like a Stone.'Debra FilcmanDebra Filcman