Genesis was one of the enduring institutions of the rock era, a phrase that doesn't hint at how the band's membership and music were remarkably fluid, encompassing at least three distinct phases, if not more. Genesis emerged from Britain's prog-rock scene of the early 1970s fronted by Peter Gabriel, a singer with a flair for eccentric theatricality and a gift for melody that helped separate his band from the likes of King Crimson and Gentle Giant. After Gabriel's departure, the band eventually evolved into a trio featuring keyboardist Tony Banks, guitarist Mike Rutherford, and...