This play-along band arrangement of O Christmas Tree is in the key of concert C. Select a link below for a page with the printable PDF for your instrument. The arrangements are all in concert C so all woodwind and brass band instruments can play the song together. The string version of this carol is also in the key of C, so you can play along with violin, viola, cello, and bass. The alto recorder version of the carol is in the key of C, too. You can also visit the main page for O Christmas Tree to find a key that matches your range.