What does "quatuor" mean in a solo piano score?

• Jan 7, 2018 - 07:10

In Maurice Ravel's La Valse transcription for solo piano (imslp #06506) there is a 3rd staff with the marking "quatuor" toward the bottom of page 2. It seems unplayable unless you have 4 hands. The existing transcription on Musescore ignores the 3rd staff.
La_Valse.png


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