In the 2014 film "Birdman", what is the primary instrument in the score?

In the 2014 film "Birdman," the primary instrument in the score is drums. This is because the film heavily focuses on the frenetic energy and tension surrounding the main character, Riggan Thomson, as he battles with his ego and tries to reclaim his fame. The drums, with their pulsating rhythms and intense beats, mirror Riggan's inner turmoil and anxiety, creating a sense of urgency and unease. Ultimately, the drums serve to enhance the film's themes of ambition, fame, and self-discovery, making them the primary instrument in the score.