O Key of David: Isaiah 9:6-7
For a child has been born for us, a son given to us; authority rests upon his shoulders; and he is named
Wonderful Counselor, Mighty God, 
Everlasting Father, Prince of Peace.
His authority shall grow continually, 
and there shall be endless peace
for the throne of David and his kingdom. 
He will establish and uphold it
with justice and with righteousness
from this time onward and forevermore.
The zeal of the Lord of hosts will do this.