Monday I started putting up the O Antiphons, in their “O Come O Come Emmanuel” version–today’s Messianic title is “Key of David”:

O come Thou Key of David, come,
And open wide our heav’nly home;
Make safe the way that leads on high
And close the path to misery. [Protestants rinse]
Rejoice! Rejoice! [plainsong users rinse]
Emmanuel shall come to thee, O Israel.

This random Catholic website I found gives an antiphon version that clarifies what locks the key opens:

“Key of David, O royal Power of Israel, controlling at your will the gate of heaven: Come, break down the prison walls of death for those who dwell in darkness and the shadow of death; and lead your captive people into freedom.”

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