The son of an avid record collector, Yûji Koseki was always attracted to making music. While attending Fukushima University, he made it his hobby to play harmonica in a street band. Following university, at the age of 21, Koseki joined Nippon Columbia, where he soon composed his first classical piece, “Tale of the Bamboo Cutter” (based on the fable of the same name, Taketori Monogatari). In 1931, Koseki moved to the Tôkyô branch of Nippon Columbia, where he toiled in both the classical- and pop-songwriting departments. Among his earlier film credits was one of the few Japanese animated films to survive World War II, titled ‘Momotarô: Umi no shinpei (1945). Later he scored a far more famous fantasy film, Mothra (1961), for which he helped write the world-famous “Mosura no Uta,” which was reprised in several later Gojira films. He is better remembered for songs such as that and others he composed at Nippon Columbia than for his sporadic movie work.