O Key of David, Come! the 4th Antiphon

From the Antiphons of the early middle ages in the church we consider the fourth Antiphon. O Key of David. Each short hymn puts forward a name for the Messiah; an expression of His power; and an aligning request from His people. In the advent season we remember that Christ's first coming was to prepare a people for His second coming. And we look with longing for that day.