Post-breakup careers: 1998–present
Chris Cornell released a solo album in September 1999, entitled
Euphoria Morning. Then in 2001 he formed the supergroup
Audioslave with the former instrumental members of
Rage Against the Machine. Cornell recorded three albums as Audioslave's vocalist until his departure (and the band's breakup) in early 2007. His second solo album
Carry On was released to mixed commercial and critical success in June 2007.
Matt Cameron initially turned his efforts to his side-project
Wellwater Conspiracy, to which both Shepherd and Thayil have contributed performances. He then worked briefly with
The Smashing Pumpkins and was even rumoured as a replacement for
Jimmy Chamberlin. In 1998, he stepped in on drums for Pearl Jam's
Yield tour, and subsequently joined the band as a permanent member.
Kim Thayil joined forces with ex-
Dead Kennedys vocalist
Jello Biafra, former Nirvana bassist
Krist Novoselic and drummer Gina Mainwal for one show, performing as the
No WTO Combo during the
WTO ministerial conference in Seattle on
December 1, 1999. Thayil later contributed guitar tracks to
Steve Fisk's 2001 album
999 Levels of Undo, as well as
Dave Grohl's side-project album
Probot, released in 2004. In 2006, Thayil performed guitar on the album
Altar, the collaboration between the bands
Sunn O))) and
Boris.
Ben Shepherd toured with
Mark Lanegan and released the second
Hater album in 2005. He also occasionally appeared on Wellwater Conspiracy albums.
Regarding a future Soundgarden reunion, Chris Cornell stated in an October 2005 interview that it would "probably not happen". He continued, "It's almost like we sealed the lid and said, this is Soundgarden and this is its lifespan, and put it out there. And it looks really great to me. I think getting back together would take the lid off that and then could possibly change what... to me seems like the perfect lifespan of the band. I can't think of any reason to mess with that." In interviews following his departure from Audioslave in February 2007, Cornell reiterated that the members of Soundgarden had no interest in reuniting.
In an interview in early August 2007, Cornell mentioned that Thayil has had the desire to release a
box set or
b-side album of Soundgarden rarities, although no further information was given.