How do you play the C 9(#5)/A# chord?

To play the C 9(#5)/A# chord on piano, play the C 9(#5) chord (C, E, G#, A# and D) with A# as the lowest bass note. Place the A# 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 C 9(#5)/A# chord means a C 9(#5) chord with A# in the bass.

C 9(#5)/A#

Q: What notes are in the C 9(#5)/A# chord?

The C 9(#5)/A# chord uses the 5 notes of the C 9(#5) chord — C (Perfect unison), E (Major third), G# (Minor sixth), A# (Minor seventh) and D (Major ninth) — with A# played as the bass note in the lowest register.

The C 9(#5) chord consists of the C (Perfect unison), E (Major third), G# (Minor sixth), A# (Minor seventh) and D (Major ninth) notes, with A# as the bass note.

Piano keyboard showing the notes for a C 9(#5)/A# chord

How to play the C 9(#5)/A# chord

Play A# as the lowest bass note in the left hand
Find C (Root) on the piano keyboard
Add E (Major third) — 4 semitones above C
Add G# (Minor sixth) — 8 semitones above C
Add A# (Minor seventh) — 10 semitones above C
Add D (Major ninth) — 14 semitones above C
Press all 6 notes simultaneously to sound the C 9(#5)/A# chord

Inversions with same root

A# 9(b5)

Related chords with different root

C 9(#5)

Related slash chords

E 7(#5)/A#