Eric Johnson answers
It's a little-known fact that Rory Gallagher nearly joined Bill Wyman in the Rolling Stones after guitarist Mick Taylor walked out following a series of blow-ups with Keith Richards.
In January 1975, Rory was invited by The Rolling Stones to come and jam/audition with The Stones in Rotterdam after Mick Taylor had suddenly left the band. Rory was picked up at the airport by Mick Jagger and spent several days jamming with them. Despite Sones Manager Marshall Chess Jr. telling Rory "I knew you were the man for the job" Rory wasn't given any confirmation from Mick or Keith so with his own Japanese tour about to begin, he simply left for Tokyo.