Berlin Cathedral
Wilhelm Carl Friedrich Sauer (23 March 1831 – 9 April 1916) was a German pipe organ builder. One of the famous organ builders of the Romantic period, Sauer and his company W. Sauer Orgelbau built over 1,100 organs during his lifetime, amongst them the organs at Bremen Cathedral, Leipzig's St. Thomas Church, and Berlin Cathedral, which is considered to be "his final great masterpiece".