降E大调是一个基于E♭音的大调，由E♭、F、G、A♭、B♭、C、D和E♭组成，调号有三个降号。相对小调是C小调，并行小调是降E小调。

The E♭ (E-flat) major scale consists of the pitches E♭, F, G, A♭, B♭, C, and D. Its key signature has three flats: B, E, A.

Its relative minor is C minor, and its parallel minor is E♭ minor.

E-flat major is often associated with bold, heroic music, in part because of Beethoven's usage. His Eroica Symphony, Emperor Concerto and Grand Sonata are all in this key. Also Beethoven's (hypothetical) 10th symphony is in the key of E-flat major. But even before Beethoven, Francesco Galeazzi identified E-flat major as "a heroic key, extremely majestic, grave and serious: in all these features it is superior to that of C."