The school has a long musical tradition, and a close association with Brentwood (Roman Catholic) and Chelmsford (Anglican) cathedrals; a number of pupils and staff sing in the choir of each cathedral. The music department has 5 full-time teaching staff and 20 visiting teachers. In 1996, Brentwood was the first school in the country to use Sibelius software and ever since has been an integral part of the Music departments GCSE, A-level and IB music courses. A Sibelius suite is available in the school's music department for student and staff use. The School is one of only 14 Steinway Schools in the country, meaning that all performance and practice pianos are Steinways.