Pipe Organ Tuning - Pitch

Pitch

For many years, there was no pitch standard across Europe. The frequency of a′ (the standard note for tuning musical instruments), for example, could range from a′=392 Hz in parts of France to a′=465 Hz (Cornet-ton pitch) in parts of Germany. Organs were often tuned differently than ensembles, even within the same region or town. The modern tuning standard of a′=440 Hz (c′=262 Hz) was proposed in 1939, and accepted by the International Organization for Standardization (as ISO 16) in 1955 and again in 1975.

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