Back to the topic - songs for David W's band, which is called Elfsong. David, I'm going to assume you want songs in the public domain.

When I was a kid, I read an old poem (prob. 19th C.) about a woman in a humble cottage, singing her baby to sleep. Outside a horrible ogre creeps up, wanting to devour them both. But the woman mentions Mary and/or Jesus in her song, and the ogre is forced to leave, gnashing its teeth in frustration.

Does anybody remember that poem? It could be set to music.