Final answer:
Berlioz's unique sound comes from his innovative orchestration and the use of an idee fixe, rather than avant-garde electronic effects, minimalist melodies, or Baroque influences.
Step-by-step explanation:
The elements that contributed to Berlioz's unique sound are a) Innovative orchestration and use of idee fixe. Hector Berlioz was known for his innovative approach to orchestration, which involved the creative and new use of orchestral instruments to achieve a wide variety of textures and sound colors. This approach, combined with his use of the idee fixe, a recurring musical theme that represents a character or concept throughout a composition, gave Berlioz's music a distinctive quality.
Unlike Arnold Schoenberg's atonality and twelve-tone technique that subverted traditional expectations, or the minimalist melodies and tonal structures of later composers, Berlioz stayed within the tonal framework but expanded the possibilities of sound within it. By contrast, his contemporaries like Strauss and Wagner also pushed the boundaries of music, eliciting strong emotional responses from their audiences. However, Berlioz did not utilize electronic effects, minimalist structures, or Baroque counterpoint and polyphony as defining elements in his music.