The Rev. Laura Merrill, Assistant to the Biship for Clergy Excellence, from the Rio Texas Conference, UMC, preaches a guest sermon entitled, "Have You Not Known?" as part of the Marsh Chapel Summer Preaching Series. The Marsh Chapel Choir sings "Tu es Petrus" by Hans Leo Hassler and "Laetentur coeli" by Hans Leo Hessler along with service music and hymns.