How do you play the C# 7(b9)(#9)/D# chord?

To play the C# 7(b9)(#9)/D# chord on piano, play the C# 7(b9)(#9) chord (C#, F, G#, B, D and E) with D# as the lowest bass note. Place the D# 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# 7(b9)(#9)/D# chord means a C# 7(b9)(#9) chord with D# in the bass.

C# 7(b9)(#9)/D#

Q: What notes are in the C# 7(b9)(#9)/D# chord?

The C# 7(b9)(#9)/D# chord uses the 6 notes of the C# 7(b9)(#9) chord — C# (Perfect unison), F (Major third), G# (Perfect fifth), B (Minor seventh), D (Minor ninth) and E (Minor tenth) — with D# played as the bass note in the lowest register.

The C# 7(b9)(#9) chord consists of the C# (Perfect unison), F (Major third), G# (Perfect fifth), B (Minor seventh), D (Minor ninth) and E (Minor tenth) notes, with D# as the bass note.

Piano keyboard showing the notes for a C# 7(b9)(#9)/D# chord

How to play the C# 7(b9)(#9)/D# chord

Play D# as the lowest bass note in the left hand
Find C# (Root) on the piano keyboard
Add F (Major third) — 4 semitones above C#
Add G# (Perfect fifth) — 7 semitones above C#
Add B (Minor seventh) — 10 semitones above C#
Add D (Minor ninth) — 13 semitones above C#
Add E (Minor tenth) — 15 semitones above C#
Press all 7 notes simultaneously to sound the C# 7(b9)(#9)/D# chord