40 years ago, one of the world's best-loved rock 'n' roll bands formed, featuring a charismatic, raspy-voiced frontman in Rod Stewart. They offered a welcome antidote to the more serious excesses of the early seventies, though at the same time being as devoted to the mayhem as they were the music. From the 'Quiet Melon' days to giving John Peel his favourite gig to their reunion tour, this tells their full story.