Eb Added 9th Chord

Chord Tones: Eb Added 9th Chord

Symbol: add9, add2 — Formula: 1-3-5-9

Degree	Note	Frequency (A=440, Equal)
1	Eb	311.127 Hz
3	G	391.995 Hz
5	Bb	466.164 Hz
9	F	349.228 Hz

Chord Notation

Notation Type	Symbol / Value
Lead Sheet Symbol	Ebadd9
All Common Symbols	add9, add2
Interval Formula	1-3-5-9
Harmonic Category	bright

Roman numeral (e.g. I, IV, V) and Nashville Number notation are key-dependent. See Keys pages for chord function within specific keys.

Inversions

Inversion	Notes (low to high)	Bass Note	Slash Notation
Root Position	Eb – G – Bb – F	Eb	Eb Added 9th Chord
First Inversion	G – Bb – F – Eb	G	Eb Added 9th Chord/G
Second Inversion	Bb – F – Eb – G	Bb	Eb Added 9th Chord/Bb
Third Inversion	F – Eb – G – Bb	F	Eb Added 9th Chord/F

Harmonic Function

The Eb add9 chord commonly functions as the mediant (♭III) in C minor or subdominant in B♭ major. Its harmonic role varies by key — in major keys it provides stable harmonic grounding.

The add9 chord adds a ninth (octave + second) to a major triad without including the seventh. It has a bright, open sound, richer than a plain major chord but less complex than a major ninth.

Common Progressions

The Eb Added 9th Chord frequently appears in these progression patterns (shown in Roman numeral notation relative to key):

Iadd9-IVadd9
Iadd9-V

Songs Featuring the Added 9th Chord

Well-known songs where the Eb Added 9th Chord — or this chord type — plays a prominent role:

Every Breath You Take – The Police
With or Without You – U2
Right Here Waiting – Richard Marx

Tuning Frequencies Across Temperaments

Frequencies shown at A=440 Hz. View full temperament data for any note.

Note	Equal Temp.	Pythagorean	Just Intonation
Eb	311.127 Hz	309.026 Hz	313.951 Hz
G	391.995 Hz	391.111 Hz	392.438 Hz
Bb	466.164 Hz	463.538 Hz	470.926 Hz
F	349.228 Hz	347.654 Hz	348.834 Hz

Scales Containing the Eb Added 9th Chord

These scales include the Eb Added 9th Chord as a diatonic or characteristic chord:

Eb major Eb lydian Added 9th Chord in all roots