Charlie on Rollins' contribution :
http://www.theguardian.com/music/2010/jan/24/sonny-rollins-charlie-wattsand Rollins himself :
http://paulsemel.com/vintage-interview-sonny-rollins-1996/" I haven’t had a lot of experience with rock musicians. Outside of the thing I did with The Stones, I haven’t listened to a lot of rock musicians. I’ve heard some rock, some of it I liked, I’ve heard guys who sound like they have something to say. But I’m not that familiar with enough rock people to give you some names."
and from 1998 :
http://paulsemel.com/vintage-interview-sonny-rollins-1998/Back in 1981, you recorded some songs with The Rolling Stones for their Tattoo You album. Would you ever do something like that again?"Oh, sure. If I thought it was something that I could relate to and I had some kind of confidence in the power of the message that would be conveyed, yeah. I mean I’m not looking to get, lining my pockets. In fact, I’m very against lining my pockets. I think this is what’s wrong with the world. Everybody’s trying to line their pockets, but we have to step back from this materialism. It’s a step back and try to live lighter on the planet. So, I’m not just doing something if I think it’s going to be lining my pockets. No, I’m too old for that. "
So if the Rolling Stones said, “We’re going to do this big tour, and we want you play on the tour and open for us,” you probably wouldn’t bother.No, I don’t think I would do it. What I did with the Stones was sort of remarkable and groundbreaking and all this stuff at the time. But I don’t think the need for it today, except to line my pockets. I’m interested in saying something, trying to do something, trying to create some music and trying to stand for something. So, that’s why I wouldn’t do a lot of things now.