Emmanuel Despax’s boyhood was spent discussing music and poetry with his poet grandfather, Jacques Charpentreau, over French patisseries. Memories of those perfect moments spent with his beloved relative, listening to Debussy, Poulenc, Ravel, Saint Saëns, has led to Despax’s latest piano release, Après un rêve. Some works are daringly familiar. Debussy’s Clair de Lune, for instance, is…