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

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

C m9(#11)/A

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

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

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

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

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

Play A 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 D (Major ninth) — 14 semitones above C
Add F# (Augmented eleventh) — 18 semitones above C
Press all 7 notes simultaneously to sound the C m9(#11)/A chord