How do you play the G# m7(alt)/C# chord?

To play the G# m7(alt)/C# chord on piano, play the G# m7(alt) chord (G#, B, E, F# and B) 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 G# m7(alt)/C# chord means a G# m7(alt) chord with C# in the bass.

G# m7(alt)/C#

Q: What notes are in the G# m7(alt)/C# chord?

The G# m7(alt)/C# chord uses the 5 notes of the G# m7(alt) chord — G# (Perfect unison), B (Minor third), E (Minor sixth), F# (Minor seventh) and B (Minor tenth) — with C# played as the bass note in the lowest register.

The G# m7(alt) chord consists of the G# (Perfect unison), B (Minor third), E (Minor sixth), F# (Minor seventh) and B (Minor tenth) notes, with C# as the bass note.

Piano keyboard showing the notes for a G# m7(alt)/C# chord

How to play the G# m7(alt)/C# chord

Play C# as the lowest bass note in the left hand
Find G# (Root) on the piano keyboard
Add B (Minor third) — 3 semitones above G#
Add E (Minor sixth) — 8 semitones above G#
Add F# (Minor seventh) — 10 semitones above G#
Add B (Minor tenth) — 15 semitones above G#
Press all 6 notes simultaneously to sound the G# m7(alt)/C# chord

Inversions with same root

C# m7(add11)

Related chords with different root

E 6(add9)

Related slash chords

E add2/C#
E add9/C#
G# m7(#5)/C#