Re the Wild Horses version:
This has been available on boots for many years, and the most probable info is this:
early 1970: Los Angeles, unidentified studio. Overdubs, supervised by Denny Cordell, on a tape sent to L.A. by the Stones via London:
Sneaky Pete Kleinow on pedal steel, Leon Russell on organ
(from Nico Zentgraf´s site)
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