What musical techniques made Domenico Scarlatti’s harpsichord music innovative?

Domenico Scarlatti’s harpsichord music is celebrated for its technical and musical innovation, which significantly expanded the possibilities of the instrument. His approach to the sonata form was particularly influential, as he evolved simple binary dance structures through sophisticated thematic organization and extended tonal ranges.1

Key innovations in his keyboard writing include:

• Keyboard Virtuosity: Scarlatti introduced spectacular techniques, most notably hand crossing, which elevated the level of harpsichord writing to a standard comparable to the later piano works of Frédéric Chopin and Franz Liszt.1
• Harmonic Audacity: His compositions are marked by the use of audacious dissonances, unconventional voice leading, and far-flung modulations that pushed the boundaries of 18th-century harmony.1
• Thematic Contrast: Scarlatti’s sonatas were structurally innovative, often differentiating between two contrasting thematic ideas within the first section of a movement, a development with far-reaching historical consequences for musical form.2
• Cultural Synthesis: He masterfully integrated the essence of Spanish popular music and dance—such as the strumming of guitars, the click of castanets, and the wiry tension of local dances—into a rigorous musical language that transcended mere virtuosity.1