Which Christmas song became the first song to be sung in space?

Well, darling, the Christmas song that made its way to outer space first was none other than "Jingle Bells." Astronauts Tom Stafford and Wally Schirra decided to spread some holiday cheer during the Gemini 6 mission in 1965 by playing a prank on mission control and singing their own version of the song. So, there you have it, "Jingle Bells" was the first song to be belted out in space, adding a touch of festive spirit to the great beyond.