Answer:
The correct answers are: "heavenly music" and "classical oracles to be silenced".
Explanation:
In the nativity ode "On the Morning of Christ's Nativity" by John Milton, the author describes Christ's Incarnation and His conquest over earthly and pagan powers. In the poem, Christ's birth causes several joyful events, including the creation of heavenly music and classical oracles being silenced. This is noticed by the phrases: "When such music sweet, their hearts and ears did greet" and "The Oracles are dumb; no voice or hideous hum".
