Keith Richards tells the story behind the Rolling Stones song “Satisfaction”:

When I wrote the song, I didn’t think of that particular riff as the big guitar riff. That all fell into place at RCA [studio in L.A.] when Gibson dumped on me one of those first Fuzz-Tone pedals. I actually thought of that guitar line as a horn riff. The way Otis Redding ended up doing it is probably closer to my original conception for the song. It’s an obvious horn riff. And when this new Fuzz Tone pedal arrived in the studio from the local dealership or something, I said, “Oh, this is good. It’s got a bit of sustain, so I can use it to sketch out the horn line.” So we left the track and went back out on the road. And two weeks later I hear it on the radio. I said, “No, that was just a demo!” They said, “No, it’s a hit.” At least Otis got it right. Our version was a demo for Otis.