How do you play the Ab 7(#9)(no5)/Bb chord?

To play the Ab 7(#9)(no5)/Bb chord on piano, play the Ab 7(#9)(no5) chord (Ab, C, Gb and B) with Bb as the lowest bass note. Place the Bb 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(#9)(no5)/Bb chord means a Ab 7(#9)(no5) chord with Bb in the bass.

Ab 7(#9)(no5)/Bb

Q: What notes are in the Ab 7(#9)(no5)/Bb chord?

The Ab 7(#9)(no5)/Bb chord uses the 4 notes of the Ab 7(#9)(no5) chord — Ab (Perfect unison), C (Major third), Gb (Minor seventh) and B (Minor tenth) — with Bb played as the bass note in the lowest register.

The Ab 7(#9)(no5) chord consists of the Ab (Perfect unison), C (Major third), Gb (Minor seventh) and B (Minor tenth) notes, with Bb as the bass note.

Piano keyboard showing the notes for a Ab 7(#9)(no5)/Bb chord

How to play the Ab 7(#9)(no5)/Bb chord

Play Bb 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 Gb (Minor seventh) — 10 semitones above Ab
Add B (Minor tenth) — 15 semitones above Ab
Press all 5 notes simultaneously to sound the Ab 7(#9)(no5)/Bb chord