How do you play the G# 7(#9)/C# chord?

To play the G# 7(#9)/C# chord on piano, play the G# 7(#9) chord (G#, C, D#, F# and B) 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# 7(#9)/C# chord means a G# 7(#9) chord with C# in the bass.

G# 7(#9)/C#

Q: What notes are in the G# 7(#9)/C# chord?

The G# 7(#9)/C# chord uses the 5 notes of the G# 7(#9) chord — G# (Perfect unison), C (Major third), D# (Perfect fifth), F# (Minor seventh) and B (Minor tenth) — with C# played as the bass note in the lowest register.

The G# 7(#9) chord consists of the G# (Perfect unison), C (Major third), D# (Perfect fifth), F# (Minor seventh) and B (Minor tenth) notes, with C# as the bass note.

Piano keyboard showing the notes for a G# 7(#9)/C# chord

How to play the G# 7(#9)/C# chord

Play C# as the lowest bass note in the left hand
Find G# (Root) on the piano keyboard
Add C (Major third) — 4 semitones above G#
Add D# (Perfect fifth) — 7 semitones above G#
Add F# (Minor seventh) — 10 semitones above G#
Add B (Minor tenth) — 15 semitones above G#
Press all 6 notes simultaneously to sound the G# 7(#9)/C# chord