In this programme The Delius Singers trace the development of music for Orthodox Christian rituals from the 10th Century to the present day. We start with the earliest sources of Znamenny chant, a style which developed from Byzantine chant in various centres across the Orthodox world, including Galicia, Kiev, Valaam, and Moscow. We show some of the earliest examples of singing different lines together in polyphony - a style which can sound remarkable to modern ears - and spend the central section of the programme demonstrating the extraordinary flowering of choral settings in the nineteenth and early twentieth centuries. There are some famous Russian composers amongst this group, including Glinka, Tchaikovsky, and Rachmaninov, but also many gems by lesser known composers in other Orthodox traditions.