Some compose great oceans, often in stormy weather. Some compose complicated water systems, with lakes, rivulets, streams, sluices. Some compose little pools of water. Several of Aldo Clementi’s works are such pools. But beware: if you step into them you won’t see the bottom. But you will see the heavens reflected in their surface. Who knows, maybe from a heavenly perspective Clementi’s collection of small water pools makes up an informal pattern, obvious but beyond words? Aldo Clementi, born in 1925, passed away in 2011. He is one of the truly great masters of the last century. On this double-CD pianists Mats Persson and Kristine Scholz perform almost everything the composer has written for one and two pianists — including Catene simmetriche, the half-hour long masterwork for two pianos from 2004.