Rainbow Tower Rainbow Tower The Rainbow Tower is a tower located at the Rainbow Plaza Canada–US border station of the Rainbow Bridge in Niagara Falls, Ontario, Canada. Construction on the tower was completed in 1947. The tower, part of the Canadian plaza of the bridge, was designed by Canadian architect William Lyon Somerville. 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♭ (musical note) A♭ (musical note) A (A-flat; also called la bémol) is the ninth semitone of the solfège. It lies a diatonic semitone above G and a chromatic semitone below A, thus being enharmonic to G, although in some musical tunings, A will have a different sounding pitch than G. When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of the A above middle C (or A) is approximately 415.305 Hz. See pitch (music) for a discussion of historical variations in frequency. A/G is the only note to have only one other enharmonic.