In 1962 the Cuban Missile Crisis brought the world to the edge of nuclear war. It was during the two weeks of negotiations between the Americans and the Russians that Do You Hear What I Hear was written as an appeal for peace.
It has become one of the favorites for the Christmas season.
Here is the youtube link to 'Do You Hear What I Hear'.
https://youtu.be/7cSq8zlzwdU