How do you play the G dim/C chord?

To play the G dim/C chord on piano, play the G dim chord (G, A# and C#) 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 dim/C chord means a G dim chord with C in the bass.

G dim/C

Q: What notes are in the G dim/C chord?

The G dim/C chord uses the 3 notes of the G dim chord — G (Perfect unison), A# (Minor third) and C# (Diminished fifth) — with C played as the bass note in the lowest register.

The G dim chord consists of the G (Perfect unison), A# (Minor third) and C# (Diminished fifth) notes, with C as the bass note.

Piano keyboard showing the notes for a G dim/C chord

How to play the G dim/C chord

Play C as the lowest bass note in the left hand
Find G (Root) on the piano keyboard
Add A# (Minor third) — 3 semitones above G
Add C# (Diminished fifth) — 6 semitones above G
Press all 4 notes simultaneously to sound the G dim/C chord