The Indispensable ComposersBy: Anthony Tommasini An exploration of the question of greatness from the chief classical music critic of The New York Times Anthony Tommasini has devoted particular attention to living composers and overlooked repertory. But, as with all classical music lovers, the canon has remained central for him. Tommasini resists the neat laws of canon formationand yet, he cant help but admit that these exalted composers have guided him through his life,