Conductor Christoph Eschenbach Christoph Eschenbach will begin his first season as music director of the National Symphony Orchestra next fall, and the programming he has planned is encouraging. In his only concerts with the hometown band between the announcement of his appointment and the beginning of his tenure, this past weekend, Eschenbach gave reasons both to hope and worry about what we can expect in the coming years. Giuseppe Verdi’s bombastic but intensely pious…