The Jet Set was one of the many incarnations of Arthur and Albert Allen aka International "G.T.O.'s" aka the Twins aka the Ghetto Fighters aka Tunde Ra Aleem & TaharQa Aleem aka the Aleems etc.

Jimi got acquainted with the Twins sometime in the mid 1960s and in 1970 Arthur and Albert sang background vocals on Jimi`s studio recordings, credited as the Ghetto Fighters.

I will add more details on the recording career of Arthur and Albert Allen later, but for now I`ll discuss the only known recording where Jimi Hendrix guests on an Allen brothers recording and not the other way round - see Recordings With Jimi Hendrix.