Every GP has one, classical musicians rely on them to maintain the perfect key in concert halls and some believe they can transmit healing powers to cure all manner of ailments. Invented in the 1700s, ...

A440, also known as Stuttgart pitch, is the musical pitch corresponding to an audio frequency of 440 Hz. This pitch standard is crucial for tuning musical instruments, particularly the note A above ...

A 128Hz medical tuning fork appeared in my collection thanks to a friend! Have you ever used a tuning fork? According to Wikipedia, the tuning fork was invented in 1711 by British musician John Shore, ...

Consider a tuning fork. It delivers a true pitch by two tines vibrating together. Muffle either side, even a little, and the note disappears. Neither tine individually produces the sweet, pure note.