A 9th chord is made up of a root, a 3rd, a 5th, a 7th (not the maj7th -- just the 7th) plus the 9th note of the scale, which of course is the same as the 2nd note of the scale, but an octave higher.
Why don't we call it a "2nd", then, instead of a 9th? Because the chord has a 7th under the 9th, whereas a 2nd wouldn't have a 7th under it.
So:
A 9th Piano Chord = Root 3rd 5th 7th 9th
Add the 9th note of the scale to the 4-note 7th chord --
therefore we have a 5-note piano chord.
What's the problem with a 5 note piano chord? Nothing, except if your hand is small like mine. I can't reach all 5 keys, so I had to come up with another way to position the chord on the keyboard. (And even if your hand is big enough to reach a 9th, you won't have enough fingers to play an 11th or 13th! So you have to come up with a way to play those humungous chords, and this is the best way I've found -- though not theonly way.).
Here is a chord chart for you.
Now forming a Major 9th is same as forming a Major 7th but you just add the 9th key. Here is a chart for you.
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