Instruct: Classify the given review into positive or negative sentiment.
Query: Porcelain-doll Mozart smashed to pieces.

Mozart's piano sonatas are some of the best-known of his works, and among the most popular of all keyboard works. Despite this, anyone listening to Gould's interpretation will wonder whether he is playing from the same score. Some of the tempos he chooses - in the middle movement of K.545 for example - are so innovative that the music at its most fundamental is wholly subverted. Also, he drags out the Alberti basses to such an extent in some movements that hidden voices emerge unexpectedly where previously there had only been simple chopped chords. The first movement of the famous sonata K.331 is in Gould's interpretation one of the most thought-provoking of all classical recordings. Gould's technical brilliance is nowhere more obvious than on this release, yet his musical intelligence is even more potently showcased here. An absolute must for any piano, Mozart or Gould lover.