MIRROR, MIRROR by Joe Henderson, Chick Corea"Joe Henderson is the essence of jazz. He embodies all the elements that came together in his generation: the virtuosity of hard bop and the avant garde. He can be harmonically abstract and yet keep to the roots. He is my inspiration. So spoke, guitar great John Scofield about the tenor saxophonist. Henderson, who died in 2001, was one of the most important jazz musicians of the last third of the twentieth century. He became an overnight sensation as