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

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

B 7(#9)/C#

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

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

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

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

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

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