Abstract: Although few secular examples of Byzantine monumental painting survive, hundreds of churches throughout the Mediterranean and the Balkans preserve impressive decorative programs. Many of these churches are well studied. Others, however, remain unpublished. Close study of the paintings provides valuable information about techniques, materials, and artistic styles. Church decoration can show enormous regional variation: specific communities and patrons often exerted influence on subject matter. Inscriptions played an important role in many churches, providing an archive of liturgical texts to be spoken and sung and epigrams to be read. Liturgical texts, hymns, and ritual performance were important inspirations for painters and communities in the Middle and Late Byzantine periods. Phenomenological effects of sound and light were also considered in monumental decoration.