Listen to Happy Xmas (War Is Over) online. Happy Xmas (War Is Over) is an English language song and is sung by The Ballads, J.Lennon and Y.Ono. Happy Xmas (War Is Over), from the album Tis The Season: Best Selling Contemporary Christmas Songs, was released in the year 2015. The duration of the song is 3:19. Download English songs online from JioSaavn.