D# / Eb

D#/Eb is a cornerstone key in jazz and classical music. Eb major is the key of heroism — Beethoven's "Eroica" symphony and many brass ensemble pieces are set in this key.

Eb is the home key of the alto saxophone and the Eb clarinet. Beethoven's Symphony No. 3 "Eroica," originally dedicated to Napoleon, established Eb major as a key of grandeur and ambition.