Inversions
This chord spans more than an octave, so it is usually played in root position and shared between the hands.
About this chord
Its formula is 1 3 5 9: the major third (M3), perfect fifth (P5) and major ninth (M9) above the root, D♭.
Counted in semitones from D♭, its notes are 0, 4, 7, 14.
An add9 chord adds the ninth (the second, an octave up) to a major triad, without a seventh. It sounds open and bright, and is everywhere in pop music.
On the piano it uses the same keys as C♯add9 (C♯ E♯ G♯ D♯). This page spells it D♭add9, which reads more simply.
It spans more than an octave, so share it between the hands: the left hand plays D♭ and the right hand plays F A♭ E♭.
Find the root first, place the other fingers over the coloured keys, then press them all together so every note sounds at the same time.
Questions and answers
What notes are in the D♭ added 9th chord?
The D♭add9 chord has four notes: D♭, F, A♭ and E♭. Counted from the root, its formula is 1-3-5-9.
What is the fingering for the D♭add9 chord?
It spans more than an octave, so share it between the hands: the left hand plays D♭ and the right hand plays F A♭ E♭.
In other keys
The chord list follows pianochord.io by Enkai Ji, used under the MIT licence. Licence