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In December 1968, Mitchell played with the Dirty Mac, an all-star band assembled for "The Rolling Stones Rock and Roll Circus". Others included John Lennon as vocalist and rhythm guitarist "Winston Leg-Thigh"; Yoko Ono providing improvised primal screams; Eric Clapton as guitarist, and Keith Richards as bassist. The group recorded a cover of "Yer Blues" as well as a jam called "Whole Lotta Yoko". While working with Hendrix from late 1969 until early 1970, Mitchell also collaborated with the Jack Bruce and Friends band fronted by ex-Cream bassist/vocalist Jack Bruce, with keyboardist Mike Mandel and jazz-fusion guitarist and future the Eleventh House frontman Larry Coryell.