Carillon century in the Low Countries. The first carillon was in Flanders, where a "fool" performed music on the bells of Oudenaarde Town Hall in 1510 by using a baton keyboard. Major figures in the evolution of the modern carillon were Pieter and François Hemony working in the 17th century. They are credited as being the greatest carillon bell founders in the history of the Low Countries. They developed the carillon, in collaboration with Jacob van Eyck, into a full-fledged musical instrument by casting the first tuned carillon in 1644, which was installed in Zutphen's Wijnhuistoren tower. The World Carillon Federation
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.