'Jumpin' Jack Flash'

 The Rolling Stones, featuring Ronnie Wood, in 2015:

And the Stones, with the original lineup, featuring the late Brian Jones on rhythm guitar, in 1968:

When asked if he felt guilty about Jones's death, Mick Jagger told Rolling Stone in 1995: "No, I don't really. I do feel that I behaved in a very childish way, but we were very young, and in some ways we picked on him. But, unfortunately, he made himself a target for it; he was very, very jealous, very difficult, very manipulative, and if you do that in this kind of a group of people you get back as good as you give, to be honest. I wasn't understanding enough about his drug addiction. No one seemed to know much about drug addiction. Things like LSD were all new. No one knew the harm. People thought cocaine was good for you."

Long-time Rolling Stones bassist Bill Wyman said of Jones, "He formed the band. He chose the members. He named the band. He chose the music we played. He got us gigs. ... he was very influential, very important, and then slowly lost it – highly intelligent – and just kind of wasted it and blew it all away."