The Grange Choir rehearses weekly after School, and performs at least once every term.  Most years they will sing in a local Music Festival, provide music for the Grange Harvest Thanksgiving and Monmouth School Harvest Service, and for the Grange Carol Service, as well as other occasions.  Entry to the choir is open to all boys in the Prep II and above, by audition, which takes place soon after School begins in September.

The Grange Choir is very much part of a family of choirs which includes the Choral Society and the Chamber Choir at Monmouth School, and occasionally boys from the Grange Choir join with one of these senior choirs for special events.  The choir is directed by the Director of Music at Monmouth School, David Lawson.