21 December     Blue Christmas
Blue Christmas (holiday) , article from Wikipedia     https://en.wikipedia.org/wiki/Blue_Christmas_(holiday)
Blue Christmas , article from Daysoftheyear.com     https://www.daysoftheyear.com/days/a-blue-christmas/
BLUE CHRISTMAS   Recordings by Elvis Presley, Johnny Cash, Brenda Lee, Celine Dion, Dean Martin and others       https://www.youtube.com/results?search_query=Blue_Christmas+song
Blue Christmas (song) , article from Wikipedia     https://en.wikipedia.org/wiki/Blue_Christmas_(song)