Perth’s Big Day Out festival got a pleasant surprise during Pearl Jam‘s set this weekend. The veteran rockers had just launched into a cover of Neil Young‘s Rockin’ in the Free World (a staple of the band’s live performances in recent years) when a guest popped up onstage for the second verse: Arcade Fire‘s Win Butler.

This is an early leg of a tour that will see Arcade Fire cover the globe. They’re coming to the States in March before heading to England in June. Check out the full list of tour dates here, and watch Win get wild with Eddie Vedder below: