Features 2011 DSD mastering using the original analog master of DG. Reissue release from Maurizio Pollini features the high-fidelity SHM-SACD format (fully compatible with standard SACD player, but it does not play on standard CD players). Part of a three-album Maurizio Pollini SHM-SACD reissue series featuring albums "Chopin: Etudes," "Beethoven: Piano Sonata No.30-32," and "Mozart: Piano Concerto No.19 & 23." *SHM-SACD (Super High Material SACD) is the ultimate Super Audio CD that utilizes the materials and technologies that were developed for the SHM-CD to further enhance the audio-resolution.