Evensong is a service of sung evening prayer developed in the Church of England. Usually led by a choir, it consists of scripture, prayer, and music offered to sanctify the evening. It developed by joining the medieval offices of Vespers and Compline following the Reformation, and it is today a beloved part of the Anglican choral and liturgical patrimony.
Though individual variance is common, Evensong follows a set structure. The service begins with a set of opening responses followed by a large selection from the book of Psalms, all sung. Two lessons of scripture are read, each followed by a canticle, usually the Song of Mary and Song of Simeon. After that come more responses, a set of collects, and usually a choral anthem before some closing prayers. Though there are thousands of choices of music and many local customs, this core structure is the canvas upon which the service is painted.
Evensong is presented with a particular ear towards quality of repertoire and execution. Attending a service, one can expect to hear the finest choral and organ music performed with great attention to detail, as well as lessons and prayers which help us live into the annual cycle of the Christian year. The best way to understand the power of this liturgy is to find a service near you and experience it for yourself!