How do you play the G# m9(#11)/C# chord?

To play the G# m9(#11)/C# chord on piano, play the G# m9(#11) chord (G#, B, D#, F#, A# and D) with C# as the lowest bass note. Place the C# 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 G# m9(#11)/C# chord means a G# m9(#11) chord with C# in the bass.

G# m9(#11)/C#

Q: What notes are in the G# m9(#11)/C# chord?

The G# m9(#11)/C# chord uses the 6 notes of the G# m9(#11) chord — G# (Perfect unison), B (Minor third), D# (Perfect fifth), F# (Minor seventh), A# (Major ninth) and D (Augmented eleventh) — with C# played as the bass note in the lowest register.

The G# m9(#11) chord consists of the G# (Perfect unison), B (Minor third), D# (Perfect fifth), F# (Minor seventh), A# (Major ninth) and D (Augmented eleventh) notes, with C# as the bass note.

Piano keyboard showing the notes for a G# m9(#11)/C# chord

How to play the G# m9(#11)/C# chord

Play C# as the lowest bass note in the left hand
Find G# (Root) on the piano keyboard
Add B (Minor third) — 3 semitones above G#
Add D# (Perfect fifth) — 7 semitones above G#
Add F# (Minor seventh) — 10 semitones above G#
Add A# (Major ninth) — 14 semitones above G#
Add D (Augmented eleventh) — 18 semitones above G#
Press all 7 notes simultaneously to sound the G# m9(#11)/C# chord