Final answer:
The question asks if a certain composer played the piano, and although the provided texts do not directly answer this, it is common knowledge that many composers, such as Schoenberg, were proficient musicians and often played the piano.
Step-by-step explanation:
The question seems to be about a specific composer and whether he was able to play the piano. While the provided information does not give a direct answer to this question, it's notable that many composers and musicians of the 19th and early 20th centuries, such as those mentioned (Arnold Schoenberg, Paganini, and Liszt), were indeed proficient at playing the piano or other instruments.
These musicians often started learning at a young age, and proficiency in an instrument was typical for composers to help them in the creation and performance of their music.
For example, Arnold Schoenberg, who challenged traditional musical scales and expectations, was also a musician and would have needed to understand instrumentation, including possibly the piano, to compose effectively. Another example is the reference to Matisse and 'The Piano Lesson' painting, which metaphorically incorporates themes of music and creation, suggesting a deep interrelation between music performance and art.
Likewise, composers such as Berlioz, Strauss, and Wagner, noted for pushing musical boundaries, would have benefited greatly from being able to play the piano.