He was influential in the post-war Japanese classical music world and his editions, published by Shunjūsha, are still the standard ones in that country. At the Tokyo Academy of Music Iguchi was a student of Leonid Kreuzer, a German piano instructor known for his powerful playing style, which Iguchi adopted. Later, Motonari Iguchi and his wife, Aiko, went on to become professors at the Tokyo Academy of Music.[1]