וְהַמְשֹׁ֣רְרִ֔ים הֵימָ֥ן אָסָ֖ף וְאֵיתָ֑ן בִּמְצִלְתַּ֥יִם נְחֹ֖שֶׁת לְהַשְׁמִֽיעַ׃
Assim os cantores Hemã, Asafe e Etã se faziam ouvir com címbalos de bronze;
Rashi on I Chronicles
And the singers: Heman, Asaph, and Ethan, etc. To make a resounding voice, they were appointed over those musical instruments.