In Chapter 21 of The Golden Road, the King family attend church in the evening.

“The world is so lovely tonight,” said the Story Girl. “I just hate the thought of going into the church and shutting all the sunlight and music outside. I wish we could have the service outside in summer.”

“I don’t think that would be very religious,” said Felicity.

“I’d feel ever so much more religious outside than in,” retorted the Story Girl.

“If the service was outside we’d have to sit in the graveyard and that wouldn’t be very cheerful,” said Felix.

“Besides, the music isn’t shut out,” added Felicity. “The choir is inside.”

“‘Music has charms to soothe a savage breast,’” quoted Peter, who was getting into the habit of adorning his conversation with similar gems. “That’s in one of Shakespeare’s plays. I’m reading them now, since I got through with the Bible. They’re great.”

Unfortunately, Montgomery makes the common mistake of attributing this to Shakespeare. It is by William Congreve.

The Mourning Bride
William Congreve

(excerpt)

Musick has Charms to sooth a savage Breast,
To soften Rocks, or bend a knotted Oak.
I’ve read, that things inanimate have mov’d,
And, as with living Souls, have been inform’d,
By Magick Numbers and persuasive Sound.
What then am I? Am I more senseless grown
Than Trees, or Flint? O force of constant Woe!
‘Tis not in Harmony to calm my Griefs.
Anselmo sleeps, and is at Peace; last Night
The silent Tomb receiv’d the good Old King;
He and his Sorrows now are safely lodg’d
Within its cold, but hospitable Bosom.
Why am not I at Peace?

Read the complete play at http://www.farid-hajji.net/books/en/Congreve_William/mb-index.html