A440Hz
A440Hz refers to a specific musical pitch, the note A above middle C. It is the standard tuning frequency used by orchestras and musical ensembles worldwide. This means that when a violinist, for example, tunes their instrument to A440, they are aiming for a sound wave that vibrates at 440 Hertz (Hz).
The standardization of A440Hz as the concert pitch occurred gradually. Before the 20th century, tuning frequencies
While A440Hz is the most common standard, some orchestras and musical traditions may use slightly different