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This is a list of supergroups, music groups whose members are already successful as solo artists or as part of other groups or well known in other musical professions. Usually used in the context of rock and pop music, the term has been applied to other musical genres such as The Three Tenors in opera.
The term is sometimes applied retrospectively when several members from a group later achieve notable success in their own right. Supergroups are sometimes formed as side projects and thus not intended to be permanent, while other times can become the primary project of the members' careers. Charity supergroups, where prominent musicians perform or record together in support of a particular cause, have been common since the 1980s.

Source: Wikipedia