This trombone music for What Child Is This? is in the key of A minor. Select the image below for a printable PDF of the melody. The string arrangement of the carol is in the key of E minor. Visit the What Child Is This? lead sheet page which features the carol in seven different keys. There you can find your desired instrumental range, or print an arrangement that allows you to play along with string instruments or the recorder.
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.