The Rev. Dr. Robert Allan Hill preaches a sermon entitled \u201cEcumenical Resolution.\u201d The Marsh Chapel Choir performs \u201cAch, Herr, du Sch\xf6pfer aller Ding\u201d by Heinrich Sch\xfctz , and \u201cO magnum mysterium\u201d by Tom\xe1s Luis de Victoria, along with service music and hymns.\xa0