How do you play the C maj13(#11)/A# chord?

To play the C maj13(#11)/A# chord on piano, play the C maj13(#11) chord (C, E, G, B, D, F# and A) 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 maj13(#11)/A# chord means a C maj13(#11) chord with A# in the bass.

C maj13(#11)/A#

Q: What notes are in the C maj13(#11)/A# chord?

The C maj13(#11)/A# chord uses the 7 notes of the C maj13(#11) chord — C (Perfect unison), E (Major third), G (Perfect fifth), B (Major seventh), D (Major ninth), F# (Augmented eleventh) and A (Major thirteenth) — with A# played as the bass note in the lowest register.

The C maj13(#11) chord consists of the C (Perfect unison), E (Major third), G (Perfect fifth), B (Major seventh), D (Major ninth), F# (Augmented eleventh) and A (Major thirteenth) notes, with A# as the bass note.

Piano keyboard showing the notes for a C maj13(#11)/A# chord

How to play the C maj13(#11)/A# chord

Play A# as the lowest bass note in the left hand
Find C (Root) on the piano keyboard
Add E (Major third) — 4 semitones above C
Add G (Perfect fifth) — 7 semitones above C
Add B (Major seventh) — 11 semitones above C
Add D (Major ninth) — 14 semitones above C
Add F# (Augmented eleventh) — 18 semitones above C
Add A (Major thirteenth) — 21 semitones above C
Press all 8 notes simultaneously to sound the C maj13(#11)/A# chord