Trivia: Music: Monkees

Hey! Hey! Their the Monkees. When the Monkees toured in the summer 1967, the opening act was little known Jimi Henricks with his group, "The Jimi Hendrix Experience" formed in London a year earlier with Noel Redding and Mitch Mitchell. I, myself, saw him in Mile High Stadium at The Denver Pop Festival. That was actually the last time the original group played together. He stopped touring with the Monkees because audiences weren't quite accepting of his music. Steve Stills unsuccessfully attempted to become one of the monkees. So on that note, name the four that did become "The Monkees".