Stephen Stills first befriended Jimi Hendrix at the June 1967 Monterey Pop Festival. Two years later, he was invited to a Hendrix session at the Record Plant in New York. Stills contributed "$20 Fine", an original song that featured him on organ and lead vocals Hendrix on multiple guitars, Mitch Mitchell on drums and Duane Hitchings (Buddy Miles Express) on piano.
The song was made available to the general public for the first time when it was included on Both Sides of the Sky, a 13 track compilation of previously unheard Hendrix material recorded between January 1968 and February 1970.
"It sounds like Crosby, Stills & Nash except it's on acid, you know," long-time Hendrix studio engineer and friend Eddie Kramer laughed to Associated Press. "Jimi is just rocking it. It's an amazing thing."