Final answer:
The subject of this question is Arts. It is asking about a symphony for piano, percussion, and celesta, which is an important part of classical music.
Step-by-step explanation:
The subject of this question is Arts. The question is asking about a symphony for piano, percussion, and celesta. A symphony is a musical composition typically written for an orchestra, and in this case, it includes piano, percussion, and celesta as the featured instruments. Symphonies are an important part of the classical music genre and are studied in music education.