He had always felt at home in the logical precision of Bach, but as he listened he began to see farther into the music, the way a stereoscope’s twinned images resolved into three dimensions. It asked a series of painful, pointed questions about mortality, about the existence of God and the conundrum of Christ, the chthonic pull of the flesh and the poor trapped spirit jailed in the ribcage, in the four dark chambers of the heart.

