Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A masterpiece...

Yes, so one's idea of a masterpiece is not someone else's idea. Nevertheless, I can't refrain myself, especially since Boulez is often depicted as all brain and no heart. How wrong! OK, so I haven't sat down with the score to do a row analysis of "Pli Selon Pli" -- but knowing Boulez's serial procedures, that might be rather impossible. But when I listen to it, I don't think of all the row forms and permutations (though I do notice a few), but rather the grand sweep, the narrative, the variety of colours and textures, the exquisite vocal writing, and most of all, the sheer beauty of this work. And yes, I did say BEAUTY! This, the Second Piano Sonata, and "Le Visage Nuptial" are my favorite Boulez works. I urge any adventurous souls to get this CD to discover one of the most striking pieces of music from this now-quickly-passing-century.