Bob, if you like slide guitar, you've got to like
Ry Cooder, right?
I've heard two different stories about his role in the slide guitar playing on "Sister Morphine" from "Let it Bleed." One is that he is the one playing on the album, and the other is that Keith Richard learned the licks from him. In any event, that is a haunting song from an incredible album.
Regards,
D-Ray