This viola arrangement of We Wish You a Merry Christmas is in the key of C. Select the image below for a printable PDF of the melody. Visit the We Wish You a Merry Christmas string play-along page for more versions of this song, so you can play it with other string instruments. The band instrument arrangement of this carol is also in the key of concert C, so you can play along with woodwinds and brass. If you are looking for the carol in a different key, visit the main page for We Wish You a Merry Christmas. More Christmas songs for viola.