What is concert F note?

Concert F (F4) is the note that sounds when the F key is pressed on a standard 88-key piano. The musical pitch of F4 is 349.23 Hz, which corresponds to the fourth F above the C below middle C. It is the fifth note in the C major scale and the fourth note in the G major scale. The concert F note is often used as the tuning reference for wind instruments and orchestras, as it is a common note for many instruments to tune to.