The South Dakota Symphony Orchestra and Chorus are in concert this weekend. They present Bach's Saint Matthew's Passion. It's an exploration of the Christian story of the death of Jesus of Nazareth as written in the biblical gospel of Matthew.Lori Walsh sat down with Delta David Gier and Timothy Campbell. Maestro Gier conducts the symphony orchestra. Maestro Campbell directs the symphony chorus. The first voice you'll hear is Maestro Gier's.