The first Christmas song played in space was "Jingle Bells" by the Apollo 8 crew. It was a way to spread holiday cheer and celebrate the season while on the Apollo 8 mission. The song was played on Christmas Eve in 1968, and it was a historic moment for both space exploration and the Christmas spirit. The Apollo 8 crew also recorded and broadcast the song to Earth, allowing people everywhere to hear it and feel the joy of the holiday season.