"A" is also used in combination with a number (e.g. A-440) to label the pitch standard. The number designates the cycles per second of sound waves. 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 seventeenth-century Europe, tunings ranged from about A-374 to A-403, approximately two to three half-steps 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 half-steps. Although the official standard today is A-440, some orchestral groups and chamber groups prefer to tune a little higher, at A-442 or even A-444. Baroque pitch is usually cited as A-415, which is a half-step lower than modern pitch.
A0 is the lowest note on the standard piano. The octaves follow A1, A2, etc.. A7 is a few pitches lower than C8, the highest note on the standard piano. The note "A" is not considered to be a certain milestone or mark to hit with voice as, for example, Tenor C is, but it can be extremely demanding in certain octaves.
|Scientific Designation||Helmholtz Designation||Octave Name||Frequency (Hz)|