E-Flat is a musical note that is one semitone lower than E and one semitone higher than D. It is commonly used in various musical scales and chords, particularly in genres like jazz, blues, and classical music. In the context of a piano, E-Flat is the black key immediately to the left of E. In music theory, E-Flat can also refer to the E-Flat major scale, which consists of the notes E♭, F, G, A♭, B♭, C, and D. This scale is often used in compositions for instruments like the trumpet and saxophone, which are frequently tuned to E-Flat.