The three Dulwich Foundation Schools (Alleyn's School, Dulwich College and James Allen's Girls' School) will join forces for a concert commemorating the 400th anniversary of the consecration of Christ's Chapel of God's Gift.
More than 450 pupils, alumni, teachers, parents and members of the local community will come together to perform Verdi's Requiem Mass at the Royal Festival Hall on 16 March.
Jane Irwin, Louise Callinan, David Butt Philip and Rodney Earl Clarke will perform the solo parts. The three directors of music - Chris Dearmer, Richard Mayo and Peter Gritton - will conduct the concert, which will also include Verdi's Pater Noster.
Tickets cost from £15-£40 (half price for children).