Before his thirtieth birthday the young Catalan composer Antonio Soler had become maestro di capilla and organist at the Escorial palace, positions he held for the rest of his life. Many of his keyboard sonatas were written for Don Gabriel, son of King Carlos III, and they represent his greatest compositional achievement, effortlessly embodying the dual influences of Domenico Scarlatti and the emergent Viennese school. Each sonata in Volume 6 has its own distinctive character, from the ingenious contrasts of No. 63 in F major and the harmonic sophistication of No. 64 in G major to the delicious Iberian colours evoked in No. 66 in C major.