"Greensleeves" is a traditional song usually played around Christmas. It was played as background music in the Season Seven episode, "It's Christmas in Canada".
Background[]
Tuong Lu Kim is depressed that he has no customers during the Christmas Holiday. His business picks up when the boys call and ask for City Airlines, which turns out to be his other business. They ask if he can take them to Canada. Tuong flew the boys Canada to ask the Prime Minister for Kyle's brother back from his real Canadian parents.