Too Many Cooks (spoil the soup) Mick Jagger (produced by John Lennon!)

In either March 1974 (around the time of the Nilsson Pussy Cats sessions) or late 1973 (around the time Phil Spector ended the Rock ‘n’ Roll sessions - no one seems to have it documented), John produced a solo Mick Jagger track: a cover of the 1969 single by 100 Proof (Aged in Soul), "Too Many Cooks (Spoil the Soup)." (Many sources refer to it as being a “Willie Dixon song,” but in fact this was actually penned by Dunbar-Wayne-Bond, who had also wrote 100 Proof’s more successful follow-up single, “Somebody’s Been Sleeping In My Bed.”) 

Jagger was backed by the "Jim Keltner Orchestra," which on this occasion included Keltner, Jack Bruce, Jesse Ed Davis, and Bobby Keys, among others. The track went unreleased for decades, though it was rumored to have been planned as a one-off Apple single for a time (until record company realities asserted themselves).

It finally saw release in 2007 on the Mick Jagger 'Best of' compilation. A source tape proved difficult to locate, until May Pang produced one stored beneath her bed.!!!