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How many keyboard sonatas did Domenico Scarlatti compose?

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Domenico Scarlatti composed a total of 555 keyboard sonatas.

These works, originally written for the harpsichord, are frequently performed on the piano today. Because the sonatas were not published in a chronological or orderly fashion, musicologist Ralph Kirkpatrick developed a widely used numbering system in the 1950s, where each work is identified by a number preceded by the letter K.1