E♭ (musical note)

E♭ (E-flat; also called mi bémol) is the first note of the E♭ major scale.
Well-known compositions in E-flat major.
The prelude to Richard Wagner's "Das Rheingold" is a famous piece of drone music that begins with a low E flat and builds to more elaborate forms of the E flat major chord. It is used in this opera to portray the motion of the river Rhine.