Our son is three months old now. It is Friday night and he is fussing, tired but not sleeping. We’re in the family room, with the radio turned on to WQED, where the Pittsburgh Symphony is being broadcast live in concert. The Tchaikovsky Piano Concerto is one we know. So we hum along starting with the opening horns. And our son joins us in delight. But by the end of the first movement, he is asleep. Good night.