A teacher colleague of mine asked me if I was aware of a piece, she thought a fugue, written with sharps in one hand and flats in the other. She thought it was perhaps called "Cat's Fugue," but I only know of the Scarlatti with that name, which is not in 2 keys. She apparently performed this piece years ago, but her scores were destroyed in a flood and she's trying to track down what it was. I told her I'd help her search.