Happy Christmas (War Is Over) was released in 1971 by the British-American rock band John Lennon and Yoko Ono. The song was written and performed by John Lennon, with Yoko Ono providing backing vocals. It's a poignant message of peace and hope, expressing the wish for the war to be over and for a world filled with love and understanding. The lyrics are timeless and universal, resonating with people from all walks of life.