I noticed that you listed John Lennon's, "Happy Christmas (War is Over." (Which I was going to recommend.) I posted a video below to show people how lucky they have it, and what disaster is occurring in the world as we type.
On a side note, when I showed this video to a family member, he said, "But why is the song called "War is over" when it really isn't?"
Upon further investigation, the lyrics after the words "Waaar is ooover" are "if you want it."