This trombone music for Good King Wenceslas is in the key of C. Select the image below for a printable PDF of the melody. The Good King Wenceslas Band Play-Along page has more versions of this song, so you can play it with other brass and woodwind instruments. The string arrangement of the carol is also in the key of C, so you can play it with violin, viola, cello, and bass. Visit the Good King Wenceslas lead sheet page which features the carol in seven different keys. On that page you can find an instrumental range or key that is more suitable for you, or print an arrangement that allows you to play along with other instruments.
See the transposition page for explanations and charts to help you determine the appropriate key to play in when performing with instruments that are not in concert key. More Christmas songs for trombone.