The Note D#/Eb

D#/Eb as a musical pitch: its frequency, spellings, and the harmony built on top of it.

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. Its reference octave pitch is 311.13 Hz (MIDI note 63). The major triad on D# is D#/Eb Major (Eb – G – Bb), and the minor triad is D#/Eb Minor (Eb – Gb – Bb).