On April 16 , 2007 , Gustavo Dudamel conducted the Stuttgart Radio Symphony Orchestra in a concert to celebrate the 80th birthday of Pope Benedict XVI , with Hilary Hahn as solo violinist . The Pope was at the concert . On April 16 , 2007 , Gustavo Dudamel conducted the Stuttgart Radio Symphony Orchestra in a concert in commemoration of the 80th birthday of Pope Benedict XVI , with Hilary Hahn as solo violinist , with the Pope himself and many other church dignitaries among the audience .