Throughout the piece, the pianist has many hurdles that the pianist must navigate.
Only pianists with tremendous skill could master such things as the four octave runs and passages where there are three notes per hand. Although these passages may seem clumsy, Tchaikovsky uses them in a way that accentuates the performer. On parts with extreme difficulty, Tchaikovsky scores the orchestra thinly, or takes them out all together so that the performer demonstrates his or her mastery of the passages. In conclusion, Rubensteins comments on the piece may have had some merit, but ultimately each comment that he had made has facts supporting both sides of his argument. Even though the structure of the piece is vastly different form the normal structure of the time, it is still regarded as one of the most popular piano concertos. There are some borrowed melodies that are not originally composed Tchaikovsky himself, but he uses them in a way that they are not directly recognizable. Some of the passages in the solo piano part my have been manufactured and seem clumsy, but Tchaikovsky has a reason for writing them the way he did, thus they can bee seen being okay. Rubenstein may have had merit in his comments to Tchaikovsky about the piece, but not enough comments to justify such a forceful delivery of those