Thou shalt bring down the noise - The tumult; the sound which they make in entering into battle; or the note of triumph, and the sound of revelry. The phrase may refer either to their shout of exultation over their vanquished foes; or to the usual sound of revelry; or to the hum of business in a vast city.

Of strangers - Of foreigners (see the note at Isaiah 25:2).

As the heat in a dry place - The parallelism here requires that we should suppose the phrase 'with the shadow of a cloud' to be supplied in this hemistich, as it is obscurely expressed in our translation by the word 'even,' and it would then read thus:

As the beat in a dry place (by the shadow of a cloud),

The noise of the strangers shalt thou humble;

As the heat by the shadow of a cloud,

The exultation of the formidable ones shalt thou bring low.

The idea thus is plain. Heat pours down intensely on the earth, and if unabated would wither up every green thing, and dry up every stream and fountain. But a cloud intervenes, and checks the burning rays of the sun. So the wrath of the 'terrible ones,' the anger of the Babylonians, raged against the Jews. But the mercy of God interposed. It was like the intervening of a cloud to shut out the burning rays of the sun. It stayed the fury of their wrath, "and rendered them impotent to do injury, just as the intense burning rays of the sun are completely checked by an interposing cloud.

The branch of the terrible ones - This is a very unhappy translation. The word זמיר zâmiyr is indeed used to denote a branch, or bough, as derived from זמר zâmar, "to prune a vine;" but it also has the I sense of "a song;" a song of praise, or a song of exultation, from a second signification of זמר zâmar, "to sing; perhaps" from the song with which the work of the vineyard was usually accompanied. See the verb used in this sense in Judges 5:3; Psalm 9:12; Psalm 30:5; Psalm 47:7; and the word which occurs here (zamir) used in the sense of a song in Psalm 119:54; 2 Samuel 23:1; Job 35:10. Here it is undoubtedly used in the sense of a song, meaning either a shout of victory or of revelry; and the idea of the prophet is, that this would be brought low by the destruction of Babylon, and by the return of the captive Jews to their own land.

Isaiah 25:5 Parallel Commentaries

Of Meditating on the Future Life.
1. The design of God in afflicting his people. 1. To accustom us to despise the present life. Our infatuated love of it. Afflictions employed as the cure. 2. To lead us to aspire to heaven. 2. Excessive love of the present life prevents us from duly aspiring to the other. Hence the disadvantages of prosperity. Blindness of the human judgment. Our philosophizing on the vanity of life only of momentary influence. The necessity of the cross. 3. The present life an evidence of the divine favour to his …
John Calvin—The Institutes of the Christian Religion

Seven Sanctified Thoughts and Mournful Sighs of a Sick Man Ready to Die.
Now, forasmuch as God of his infinite mercy doth so temper our pain and sickness, that we are not always oppressed with extremity, but gives us in the midst of our extremities some respite, to ease and refresh ourselves, thou must have an especial care, considering how short a time thou hast either for ever to lose or to obtain heaven, to make use of every breathing time which God affords thee; and during that little time of ease to gather strength against the fits of greater anguish. Therefore, …
Lewis Bayly—The Practice of Piety

Hope for the Heathen
Throughout his ministry Isaiah bore a plain testimony concerning God's purpose for the heathen. Other prophets had made mention of the divine plan, but their language was not always understood. To Isaiah it was given to make very plain to Judah the truth that among the Israel of God were to be numbered many who were not descendants of Abraham after the flesh. This teaching was not in harmony with the theology of his age, yet he fearlessly proclaimed the messages given him of God and brought hope …
Ellen Gould White—The Story of Prophets and Kings