וַיְהִ֣י כְ֠אֶחָד למחצצרים [לַמְחַצְּרִ֨ים] וְלַמְשֹֽׁרֲרִ֜ים לְהַשְׁמִ֣יעַ קוֹל־אֶחָ֗ד לְהַלֵּ֣ל וּלְהֹדוֹת֮ לַיהוָה֒ וּכְהָרִ֣ים ק֠וֹל בַּחֲצֹצְר֨וֹת וּבִמְצִלְתַּ֜יִם וּבִכְלֵ֣י הַשִּׁ֗יר וּבְהַלֵּ֤ל לַיהוָה֙ כִּ֣י ט֔וֹב כִּ֥י לְעוֹלָ֖ם חַסְדּ֑וֹ וְהַבַּ֛יִת מָלֵ֥א עָנָ֖ן בֵּ֥ית יְהוָֽה׃
Rashi on II Chronicles
And the trumpeters, etc. were as one The meaning is: And they were united - all the trumpeters together. Now for what purpose were they united? To make one sound together to praise and to thank the Lord.