How do you play the A# maj9(#11)/C# chord?

To play the A# maj9(#11)/C# chord on piano, play the A# maj9(#11) chord (A#, D, F, A, C and E) 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 A# maj9(#11)/C# chord means a A# maj9(#11) chord with C# in the bass.

A# maj9(#11)/C#

Q: What notes are in the A# maj9(#11)/C# chord?

The A# maj9(#11)/C# chord uses the 6 notes of the A# maj9(#11) chord — A# (Perfect unison), D (Major third), F (Perfect fifth), A (Major seventh), C (Major ninth) and E (Augmented eleventh) — with C# played as the bass note in the lowest register.

The A# maj9(#11) chord consists of the A# (Perfect unison), D (Major third), F (Perfect fifth), A (Major seventh), C (Major ninth) and E (Augmented eleventh) notes, with C# as the bass note.

Piano keyboard showing the notes for a A# maj9(#11)/C# chord

How to play the A# maj9(#11)/C# chord

Play C# as the lowest bass note in the left hand
Find A# (Root) on the piano keyboard
Add D (Major third) — 4 semitones above A#
Add F (Perfect fifth) — 7 semitones above A#
Add A (Major seventh) — 11 semitones above A#
Add C (Major ninth) — 14 semitones above A#
Add E (Augmented eleventh) — 18 semitones above A#
Press all 7 notes simultaneously to sound the A# maj9(#11)/C# chord