Something for the weekend. One of the earliest Christian hymns still popularly sung, Let All Mortal Flesh Keep Silence is based upon the Prayer of the Cherubic Hymn in the Liturgy of Saint James of the Church in Jerusalem. During the Oxford Movement in the Church of England in the nineteenth century, an Anglican minister Gerard Moultrie made an English translation of the Greek text. The tune to which it is set, Picardy, is a French folk tune that dates back to at least the seventeenth century. The hymn was set to the tune by Ralph Vaughan Williams in 1906, and has proven immensely popular.