A (usually) rock band made up of popular and established artists. Oten assembled for a single project and usually heavily hyped, drawing on the combined popularity of the individual artists.
May or may not be successful
See also: synergy, eric clapton
Crosby, Stills, Nash, and Young
The Firm(the rock and hip-hop ones)
Class of '99 - Layne Staley (Alice in Chains), Tom Morello (Rage Against The Machine, Audioslave), Stephen Perkins (Jane's Addiction, Porno For Pyros, The Panic Channel), and Martyn LeNoble (Porno For Pyros, Jane's Addiction)
Class of '99. Now that's what I call a supergroup!
A bunch of old famous musicians who used to make good music with their famous bands forming another band. Based on the popularity of their old bands. Usually this band makes music that is mediocre at best and just jam on stage for a bunch of other old people who liked their old bands. While not always bad these bands tend to make music that sounds outdated.
SupergroupCream Asia Damn Yankees Crosby, Stills Nash, and Young Bad Company The Firm Temple of the Dog Audioslave Velvet Revolver Heaven and Hell Chickenfoot The Dead Weather Them Crooked Vultures