Class of '99
Class of '99 was a short-term alternative rock supergroup consisting of members from notable rock bands: Layne Staley of Alice in Chains as the vocalist, Tom Morello of Rage Against the Machine as lead guitarist, Stephen Perkins of Jane's Addiction as the drummer, and Martyn LeNoble of Porno for Pyros as bass guitarist. They also had the help of Matt Serletic on keyboards.
source: Wikipedia