וַיִּשָּֽׁבְעוּ֙ לַיהוָ֔ה בְּק֥וֹל גָּד֖וֹל וּבִתְרוּעָ֑ה וּבַחֲצֹצְר֖וֹת וּבְשׁוֹפָרֽוֹת׃
And they swore unto the LORD with a loud voice, and with shouting, and with trumpets, and with horns.
Read midrashic interpretation of II Chronicles 15:14: and classical rabbinic exegesis.