The level IV is for choristers who are in 4th grade and above and have mastered the vocal skills and techniques of Preparatory, Primary and Intermediate as well as pass the internal audition. Challenging literature at a high level of proficiency is studied. A certain amount of maturity of voice is required. Curriculum includes advanced literature, 4 part harmony, and continuing to emphasize in vocal development. They have the chance to tour locally and nationally.