what is the past behind this group?
The term may have come from the 1968 album "Super Session" with Al Kooper, Mike Bloomfield, and Stephen Stills.
Supergroup (music)
The term may have come from the 1968 album "Super Session" with Al Kooper, Mike Bloomfield, and Stephen Stills. 
who sang in we are the world haiti UNANSWERABLE what is we are the world 25? It is a charity single. who performed this single? Supergroup Artists where are they from? UNANSWERABLE
wiki:5360886
Supergroup (music) [SEP] History
Also in 1968 Jack Bruce joined Tony Williams Lifetime, composed of bassist and vocalist Bruce, and three famous Miles Davis alumni: drummer Tony Williams, guitarist John McLaughlin, and keyboardist Khalid Yasin (nee Larry Young). The term may have come from the 1968 album "Super Session" with Al Kooper, Mike Bloomfield, and Stephen Stills. The coalition of Crosby, Stills & Nash (later Crosby, Stills, Nash & Young) in 1969 is another early example, given the success of their prior bands (The Byrds, Buffalo Springfield, and The Hollies respectively).