F (musical note)
F is a musical note, the fourth above C or fifth below C. It is the fourth note and the sixth semitone of the solfège. It is also known as fa in fixed-do solfège.[1] It has enharmonic equivalents of E♯ (E-sharp)[2] and G (G-double flat),[3] amongst others.
When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of Middle F (F4) is approximately 349.228 Hz.[4] See pitch (music) for a discussion of historical variations in frequency.