佐橋俊彦
"The Big O" was scored by "Geidai" alumnus Toshihiko Sahashi. His composition is richly symphonic and classical, with a number of pieces delving into electronica and jazz. Chosen because of his "frightening amount of musical knowledge about TV dramas overseas," Sahashi integrates musical homages into the soundtrack. The background music draws from "film noir", spy films and sci-fi television series like "The Twilight Zone". The battle themes are reminiscent of Akira Ifukube's compositions for the "Godzilla" series.