The Riverside Church carillon, built in 1930, was a gift of John D. Rockefeller, Jr. in memory of his mother. The worlds’ largest carillon by weight, the Riverside carillon contains 74 cast bronze bells. The Bourdon bell, weighing 40,000 pounds (ringing on the hour) is the largest tuned bell in the world. The bells swing a peal each Sunday at 10:20 a.m. The Carillon prelude follows at 10:30 a.m., and can be heard and viewed online as part of the…