How do you play the Ab 7(#11)/Cb chord?

To play the Ab 7(#11)/Cb chord on piano, play the Ab 7(#11) chord (Ab, C, Eb, Gb and D) with Cb as the lowest bass note. Place the Cb note below the other chord tones. Slash chords specify a particular bass note different from the chord root.

What is a slash chord?

A slash chord (or compound chord) is written as Chord/Bass and specifies both a chord and a bass note. The note to the right of the slash is played as the lowest note. The Ab 7(#11)/Cb chord means a Ab 7(#11) chord with Cb in the bass.

Ab 7(#11)/Cb

Q: What notes are in the Ab 7(#11)/Cb chord?

The Ab 7(#11)/Cb chord uses the 5 notes of the Ab 7(#11) chord — Ab (Perfect unison), C (Major third), Eb (Perfect fifth), Gb (Minor seventh) and D (Augmented eleventh) — with Cb played as the bass note in the lowest register.

The Ab 7(#11) chord consists of the Ab (Perfect unison), C (Major third), Eb (Perfect fifth), Gb (Minor seventh) and D (Augmented eleventh) notes, with Cb as the bass note.

Piano keyboard showing the notes for a Ab 7(#11)/Cb chord

How to play the Ab 7(#11)/Cb chord

Play Cb as the lowest bass note in the left hand
Find Ab (Root) on the piano keyboard
Add C (Major third) — 4 semitones above Ab
Add Eb (Perfect fifth) — 7 semitones above Ab
Add Gb (Minor seventh) — 10 semitones above Ab
Add D (Augmented eleventh) — 18 semitones above Ab
Press all 6 notes simultaneously to sound the Ab 7(#11)/Cb chord