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 ...

Thus, notes of a lower pitch are sometimes perceived as more relaxing than notes that are higher pitched. Again, this doesn’t ...

For at least 80 years, that standard pitch frequency has been A440 Hz — which defines the A note above middle C, and by extension, all the other notes around it. But this longstanding tuning standard ...