Two of the Rolling Stones' members got to know each other during their childhood. One was Mick Jagger, who was the other?

Explanation

The Rolling Stones were formed in the early 60's. Keith Richards and Mick Jagger were childhood friends and classmates in Dartford, Kent until the Jaggers moved. Later Jagger formed a garage band with Dick Taylor. Jagger and Keith Richards became reacquainted in 1960 and Richards joined Jagger and Taylor. They were joined by Alan Etherington and Bob Beckwith and adopted the moniker the Blue Boys. In April 1962, the Blue Boys visited the Ealing Jazz Club, and there they met Brian Jones and also future Rolling Stones members Ian Stewart and Charlie Watts.