How do you play the C undefined/D# chord?

To play the C undefined/D# chord on piano, play the C undefined chord ( and undefined) with D# as the lowest bass note. Place the D# note below the other chord tones. Slash chords specify a particular bass note different from the chord root.

What notes are in the C undefined/D# chord?

The C undefined/D# chord uses the 0 notes of the C undefined chord — and undefined — with D# played as the bass note in the lowest register.

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 undefined/D# chord means a C undefined chord with D# in the bass.

C /D#

The C undefined chord consists of the notes, with D# as the bass note.

Piano keyboard showing the notes for a C undefined/D# chord

How to play the C undefined/D# chord

Play D# as the lowest bass note in the left hand
Find C (Root) on the piano keyboard
Press the note to sound the C undefined/D# chord