Attention! Piano keyboards have a manufacturing defect.

- discovered by Gregory Shir!

U.S. Patent No. 9064478


Closeup of Mozart Best Piano keyboard
Mozart's Piano
had equally-spaced keys.
Yours doesn't!

Equalizing the width of the white keys
has only slightly changed the shape of the keytops:
Patent Figure Mozart Best Piano
Mozart Best Piano Patent Figure Black Key with arrows
The tops of the black keys extend slightly further forward
to add leverage and accuracy.

black key standard piano
Compare to the angle D2 above
to D1 of the standard piano keyboard black keys.


Mozart Best Piano closeup of angled black keys

Here it is up close. If you notice, the black keys are angled less.
Haven't you ever had to stretch for a black key?  Now you don't have to.

Our patent makes VERY slight changes to the width of white keys
and the angle of the front of the black keys.

Our black key retrofit kit and a completely retrofitted piano are on EBay:
Gregory Shir model retrofit for black keys

This is the first time a modified key top has been patented (Patent #9064478).

This key top can be set up for almost any piano. The design of the keys corrects the pianist's hand movements and resting positions to prevent Carpal Tunnel Syndrome while improving posture, thus allowing the pianist to practice easier with less discomfort.

compare two black keys
Compare older black keys with ours:
*More responsive to touch
*Easier to reach keys
*Ergonomically correct
*Easier to play rapid passages


Please contribute to our project.
We want to make playing piano easier for everyone, kids and adults.


Hranush Martirosyan A. Mozart "Ah, vous dirai-je, Maman" My Happy Birthday Present!
Hranush Martirosyan playing Mozart's variations on "Twinkle-Twinkle, Little Star"
on prototype of Mozart Best Piano.
"I'm not saying 'su ym ssik' like Mozart - only 'close my eyes!'
"I agree! The new piano made by G. Shir with changes in the layout of the keys, makes piano playing easier."

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U.S. Patent No. 9064478

©2017 Gregory Shir
gregoryshir @
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