A new holiday tradition

How many tunes can you sing with the words of "Amazing Grace"?

So far I have:
Joy to the World
How Great Our Joy!
O Christmas Tree
O Come All Ye Faithful
O Come, O Come, Emmanuel
It Came Upon the Midnight Clear
The First Noel

And, of course, the classic Gilligan's Island theme tune and What Child Is This.

Some repetition may be necessary to fit the tune, as in Joy to the World.