E♭ (musical note)

E♭ (E-flat) or mi bémol is the fourth semitone of the solfège.

In equal temperament it is also enharmonic with F (F-double flat).

When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of the E♭ above middle C (or E♭4) is approximately 311.127 Hz.

[1] See pitch (music) for a discussion of historical variations in frequency.

In German nomenclature, it is known as Es, sometimes (especially in the context of musical motifs, e.g. DSCH motif) abbreviated to S.