Midrash sa Mga Awit 47:2: Midrash Tehillim & Shir HaShirim Rabbah

“… when His anger is suddenly kindled” (Psalms 2:12). A parable: There was once a king who became angry with the residents of a certain province. The residents of that province went to appease the son of the king, that he should appease the king [on their behalf]. The son went and appeased his father. After the king had been appeased by his son, the residents of that province came to sing a hymn of praise to the king. He said to them, “You’re singing a song of praise to me?! Go and [sing a song of praise] to my son, for had it not been for him, I would have destroyed the province.” So too, the idolatrous nations will want to sing a song of praise to the Holy One, blessed be He, as it is said, “All the nations clap your hands; [raise a shot of joy for God].” (Psalms 47:2). The Holy One, blessed be He, will say to them, “You’re singing a song of praise to me?! Go and sing to Israel, for had it not been for them, you wouldn’t have existed even for a moment, as it is said, “Sing aloud, all you nations, to [God’s] people” (Deuteronomy 32:43). An alternative interpretation of “… when His anger is suddenly kindled” (Psalms 2:12). When a king of flesh and blood is angry, he isn’t at ease. But the Holy One, blessed be He, isn’t so. Rather, when He is angry He is [nevertheless] at ease, as it is said, “His anger is suddenly kindled” against the idolatrous nations, but [at one and the same time, the verse can describe Israel in the following terms:] “Blessed are all who take refuge in [God].” This refers to the Israelites, that they take refuge in God, all the while that He isn’t burning [in rage against] them.

“Let us exult and rejoice in you.” Ten expressions of joy are employed in Israel’s regard: Gila, sisa, simḥa, rina, pitzḥa, tzahala, alatza, elza, ḥedva, terua. Gila, “rejoice [gili] greatly, daughter of Zion” (Zechariah 9:9); sisa, “I will be gladdened [sos asis] in the Lord” (Isaiah 61:10); simḥa, “rejoice [simḥu] with Jerusalem” (Isaiah 66:10); rina, “sing [roni] and rejoice, daughter of Zion” (Zechariah 2:14); pitzḥa, “burst [pitzḥi] into song and rejoice” (Isaiah 54:1); tzahala, “shout [tzahali] and sing” (Isaiah 12:6); alatza, “my heart rejoices [alatz] in the Lord” (I Samuel 2:1); elza, “my heart exults [vaya’aloz], and with my song I give thanks to Him” (Psalms 28:7); ḥedva, “the children of Israel…performed [the dedication of this House of God with joy [beḥedva]]” (Ezra 6:16); terua, “shout with joy [hariu] to the Lord, all the earth” (Psalms 98:4), “shout [hariu] to God with a joyous voice” (Psalms 47:2). There are some who remove terua and insert ditza, just as you say: “Anguish rejoices [tadutz] before it” (Job 41:14); it dances like that mudfish.

To the choirmaster. A Psalm of the sons of Korah. All you peoples, clap your hands. This is what the verse says (Proverbs 29:2), "When the righteous are in authority, the people rejoice; but when the wicked rule, the people groan." When the wicked are in power in the world, everyone sighs and are in distress, and no one walks with his head held high. Similarly, Solomon says (Proverbs 28:28), "When the wicked rise, men hide themselves; but when they perish, the righteous increase." It is difficult for the Lord when a person rules over another person to harm him. And so it says (Isaiah 28:2), "Behold, the Lord has a mighty and strong one, like a tempest of hail and a destroying storm, like a flood of mighty waters overflowing, who will bring them down to the earth with His hand." What is meant by "with His hand"? It refers to the hand of man who ruled over his fellow man. Therefore it is said, "All you peoples, clap your hands." Why is this so? (Psalm 10:15) "Break the arm of the wicked and evil-doer; seek out his wickedness until you find none." Therefore, for the Lord is high and awesome, a great King over all the earth....