Choral Evensong (Evening Prayer sung by choir) is a distinctively Anglican worship service derived from the ancient monastic daily office practices of awaiting God’s presence, hearing him speak through his word, and offering intercessory prayer to him. The form and language of tonight’s service were developed in the mid 1500s by Archbishop of Canterbury Thomas Cranmer and have been used continuously since then. Choral Evensong is sung most days in many British cathedrals, churches, and college chapels. Here is a link to the program.