Barky, “Middle C” in music is the designation give to the C note in the center of the common 7 octave piano keyboard. It is a specififc frequency. “F above middle C” is the first F note above that note, also a specific frequency.
My piont was that I seriously doubt of either of the brothers could intentionally hit an F note (or any other note) in any octave, above or below middle C. Unless one of them actually has a hidden talent. And some training.