Carillon be sounded together in varied chords with harmonious and concordant effect." The GCNA defines a "traditional carillon" as one played from a carillon mechanical (not electrified) baton keyboard, and a "non-traditional carillon" as a musical instrument with bells, but played by automated mechanical or electro-mechanical means, or from an electrical or electronic keyboard. Since each note is produced by an individual bell, a carillon's musical range is determined by the number of bells it has. Different names are assigned to instruments based on the number of bells they comprise: The Riverside Carillon in New York City has the largest tuned
A (musical note) the pitch standard. The number designates the frequency in hertz. A lower number equals a lower pitch. By an international treaty signed in 1939, modern pitch is standardized at A-440. However, tuning has varied over time, geographical region, or instrument maker. In 17th-century Europe, tunings ranged from about A-374 to A-403, approximately two to three semitones below A-440. Historical examples exist of instruments, tuning forks, or standards ranging from A-309 to A-455.3, a difference of almost six semitones. Although the official standard today is A-440, some orchestral groups and chamber groups prefer to tune a little higher, at A-442 or