O King of nations, and their Desired, the Cornerstone who makes all one: come and save our race, whom you formed out of clay.
The title in this antiphon is sometimes translated "O King of the Gentiles" or, in Latin, "O Rex Gentium":
The 2008 World Youth Day theme song echoes this antiphon.
It begins "Every nation, every tribe, come together to worship you ... ":
Hat-tip: Googling God