Julie Swihart

Ninth Chords

Let’s look at how to play a B9 chord on the piano. We’ll also learn the pattern for building any other ninth chord.

What Are Ninth Chords?

Ninth chords are major chords with two added notes. The added notes are the seventh note of the matching major scale, lowered 1/2 step, and the ninth note of the scale.

So to build a ninth chord, we’ll start by building a major chord. Major chords are built using the first, third and fifth notes of the matching major scale.

Next we’ll find the seventh note of the matching major scale and lower it 1/2 step.

Then we’ll add the ninth note of the scale to the chord. Since a scale only has eight notes, we’ll repeat the scale into the next octave to find the ninth note. This is the same note as the second note of the scale, but one octave up.

Chord Types Printable

Learn to play 17 types of piano chords using 12 different root notes with this 34-page PDF! Chords are sorted both by their root note (C, D, E, etc.) and type (major, minor, augmented, diminished, etc.).

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How to Play a B9 Chord

Now let’s build a B9 chord on the piano. We’ll start by building a B major chord. We can build a B major chord using the first, third and fifth notes of the B major scale: B – D♯ – F♯

Then we’ll add the seventh note of the B major scale, lowered 1/2 step: A

Then we’ll repeat the scale into the next octave to find the ninth note: C♯

So to play a B9 chord, we’ll play:

B – D♯ – F♯ – A – C♯

We can use this pattern to build any other ninth chord! We’ll first build a major chord, then we’ll add the seventh note of the matching major scale, lowered 1/2 step, and the ninth note of the scale.

Fingering

You probably can’t reach all these notes with your right hand, so here are a few options:

You can re-arrange the notes by moving the C♯ back down to the position of a second. Or you can play the B with your left hand and the other notes with your right.

If you move the C♯ down to the position of a second, you’ll play the notes in this order: B – C♯ – D♯ – F♯ – A using fingers 1 – 2 – 3 – 4 – 5 (thumbs are 1’s).

If you play the B with your left hand and the other notes with your right, you can use fingers 1 – 2 – 3 – 5 to play the D♯ – F♯ – A – C♯.

Conclusion

Now you know how to play a B9 chord on the piano, and you can use this knowledge to build any other ninth chord!