Who is the composer of the piece performed by the New York Philharmonic under Leonard Bernstein?

The composer of the piece performed by the New York Philharmonic under Leonard Bernstein is Hector Berlioz. Berlioz is renowned for his innovative orchestration and dramatic compositions, which often push the boundaries of classical music. One of his most famous works, "Symphonie fantastique," exemplifies his distinct style and is frequently performed by major orchestras, including the New York Philharmonic. Bernstein, known for his dynamic conducting and deep understanding of the Romantic repertoire, would have been an ideal interpreter of Berlioz's music, capturing its emotional depth and theatrical flair. In contrast, while Debussy, Faure, and Rachmaninoff are also notable composers, their works did not align with the specific performance context mentioned in the question regarding Bernstein and the New York Philharmonic.