Here we have the Rolling Stones - in psychedelic mode - performing "Lady Jane" on some show in the '60s.
I am a big fan of the Stones' psychedelic phase - in fact, Flowers (along with the Beatles' Revolver) was the first CD I ever bought back in 1986. A lot of fans preferred it when they got back to making rock 'n' roll records - but I loved "Ruby Tuesday", "She's a Rainbow", "Child of the Moon" and such. I even liked Her Satanic Majesties Request - the record that kind of killed the genre. (It's an acquired taste).
By the way, that's a dulcimer that Brian Jones is playing - an instrument of American origin, interestingly enough.