The Rainbow Tower houses a carillon—a musical instrument consisting of a baton keyboard that controls a series of bells. The Rainbow Carillon is sounded three times a day, 365 days a year. It features 55 bells with a total weight of over 43 tons. The instrument is controlled via a series of 55 oak batons and 30 foot pedals. The largest bell, called a bourdon, is in diameter and tall, weighing in at 10 tons. Musically the pitch of this bell is E. The smallest bell in the instrument weighs less than and has a circumference of .