Howard Shelley's splendid series of Clementi's complete piano sonatas continues with a fourth volume containing some of the composer's most important works. The ten sonatas of Opp. 25, 26, and 33 heard here are all products of a period in Clementi's life when he was the darling of the London music scene. As well as stunning viruosity, the works recorded here contain a high degree of compositional originality and foward-looking piano writing. The A major sonata (No. 4) has a curiously nineteenth-century sound. The first movement displays a profusion of melodic ornamentation reminiscent of Chopin. The fifth, perhaps Clementi's greatest sonata, was much championed by Horowitz, among others.