Soundgarden has been stretching out the Superunknown 20th anniversary celebration for many months, and that celebration continued last night on The Tonight Show in conjunction with the album’s deluxe reissue. The band performed “Spoonman” (which Fallon rightfully dubbed a classic) for the broadcast and “My Wave” for a web exclusive. They also sat down backstage to explain how they wrote “My Wave.” Watch all that below.