On the Mystic Letters

Ring out ye crystal spheres!
Once bless our human ears
 (If ye have power to touch our senses so)
And let your silver chime
Move in melodious time,
 And let the bass of Heav'n's deep organ blow;
And with your ninefold harmony
Make up full consort to th'angelic symphony.
 — John Milton, On the Morning of Christ's Nativity