After the success of "Superunknown" in 1994, the Seattle sound fell into creative decline, and Soundgarden broke up in 1997. Cornell went on to join forces with former members of another splintered alternative-rock era band, Rage Against the Machine, in Audioslave, and also released a string of solo albums that showed the range of his musical interests, including the more introspective "Euphoria Morning" (1999) and the ill-fated pop turn on the Timbaland-produced "Scream" (2009). Soundgarden eventually reunited and released its first studio album in 16 years in 2012, "King Animal." Last year, the band began working on another studio album, but no release date has been announced.