How did Bach define music?

Delta David Gier conducted the New York Philharmonic, the Philadelphia Orchestra, the Cleveland Orchestra, the Chicago Symphony, the St. Louis Symphony, and the Minnesota Orchestra. In Europe, his engagements include the Bergen Philharmonic, the Polish National Radio Symphony, and the Bucharest Philharmonic, along with many other orchestras in Italy, Hungary, Poland, Romania, Slovakia and Turkey. Here, he answers questions about "The Role of Art in the Church," given at the 2019 European Leadership Forum.