The artistic prowess of saxophonist John Coltrane was so expansive and influential - even in his own short lifetime, let alone in the decades since his death - that it's difficult to quantify or differentiate his significance as a leader, a collaborator, a sideman or any other role in the jazz idiom. What's certain, though, is that some of his most pivotal session work took place on the Prestige label in the 1950s.