Examine the manuscript of Handel’s Messiah. Although the full score hasn’t been digitised yet, much of the Christmas music has been photographed, and you can listen to the festive chorus For unto us a child is born. Courtesy of the British Library. http://www.bl.uk/turning-the-pages/?id=38fd72b2-5b98-4fc2-aaae-98e717e8d512&type=book