Hector Berlioz is portrayed as a French composer who goes to Moscow to conduct his works in 'The Master and Margarita.' He is regarded as a conceited and egotistical person, and his music is said to have a demonic vibe. Several characters in the book, including Berlioz, are intended to stand in for the impact of Western culture on Russia. His part in the story emphasizes how significant art and culture can impact a person's life, whether for the better or worse.