This bassoon music for Good Christian Men, Rejoice is in the key of B flat. Select the image below for a printable PDF of the melody. The Good Christian Men, Rejoice Band Play-Along page has more versions of this song, so you can play it with other woodwind and brass instruments. The string arrangement of the carol is in the key of D. Visit the Good Christian Men, Rejoice lead sheet page which features the carol in seven different keys. On that page you can find your desired instrumental range, or print an arrangement that allows you to play along with string instruments.