Core Worlds Culture, also called Core Worlds Classical Culture, was a class taken by cadets attending the Galactic Empire's Royal Imperial Academy, which was located on Coruscant. The course covered a variety of topics, including Chalice and Altar, the most famous composition by opera writer Igern. Ciena Ree and Thane Kyrell were both students in that class while they were at the Royal Academy. To get ready for the test, Ciena once decided to listen to the Chalice and Altar opera every evening.