A highly competent conductor whose repertory was extensive, Peter Maag made his reputation in Europe, but was a presence in American theaters as well. Although most of his life was devoted to opera, he made several recordings that honestly represented his eloquence in the symphonic literature and suggested that he might have made an even more appreciable impact there had he spent more time in concert work. After musical training in Zürich and Basel, Maag studied with Ernest Ansermet in Geneva and soon became an assistant to the elder conductor. He served first as coach and cho...