The first four movements of the Mass for Double Choir were also completed in 1922, the Agnus Dei being added four years later, but Martin did not allow the work to be performed until 1963. After its premiere he explained why it had remained unseen and unheard for all those years: ‘I considered it to be a matter between God and myself,’ he wrote. ‘I felt that a personal expression of religious belief should remain secret and hidden from public opinion.’ (notes - John Bawden)