How do you play the C m7(b9)(#9)/B chord?

To play the C m7(b9)(#9)/B chord on piano, play the C m7(b9)(#9) chord (C, D#, G, A#, C# and D#) with B as the lowest bass note. Place the B 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 m7(b9)(#9)/B chord means a C m7(b9)(#9) chord with B in the bass.

C m7(b9)(#9)/B

Q: What notes are in the C m7(b9)(#9)/B chord?

The C m7(b9)(#9)/B chord uses the 6 notes of the C m7(b9)(#9) chord — C (Perfect unison), D# (Minor third), G (Perfect fifth), A# (Minor seventh), C# (Minor ninth) and D# (Minor tenth) — with B played as the bass note in the lowest register.

The C m7(b9)(#9) chord consists of the C (Perfect unison), D# (Minor third), G (Perfect fifth), A# (Minor seventh), C# (Minor ninth) and D# (Minor tenth) notes, with B as the bass note.

Piano keyboard showing the notes for a C m7(b9)(#9)/B chord

How to play the C m7(b9)(#9)/B chord

Play B as the lowest bass note in the left hand
Find C (Root) on the piano keyboard
Add D# (Minor third) — 3 semitones above C
Add G (Perfect fifth) — 7 semitones above C
Add A# (Minor seventh) — 10 semitones above C
Add C# (Minor ninth) — 13 semitones above C
Add D# (Minor tenth) — 15 semitones above C
Press all 7 notes simultaneously to sound the C m7(b9)(#9)/B chord

Related slash chords

C m7(b9)/B
D# m7(add6)/B
D# 7(add6)/B