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Johann Sebastian Bach was lauded in his own lifetime as a virtuoso organist, and his impeccable writing for keyboard distinguishes such masterpieces as his Concerto for Two Harpsichords. Schubert’s Rondo in A Major coaxes orchestral immensity from one keyboard, and Schumann’s Andante and Variations likewise exploits an alchemical ensemble of two pianos, two cellos, and horn to ravishing effect. Bartók’s pathbreaking Sonata for Two Pianos and Percussion displays Bach’s tangible influence in the twentieth century.