וְהַמְשֹׁ֣רְרִ֔ים הֵימָ֥ן אָסָ֖ף וְאֵיתָ֑ן בִּמְצִלְתַּ֥יִם נְחֹ֖שֶׁת לְהַשְׁמִֽיעַ׃
노래하는 자 헤만과 아삽과 에단은 놋제금을 크게 치는 자요
Rashi on I Chronicles
And the singers: Heman, Asaph, and Ethan, etc. To make a resounding voice, they were appointed over those musical instruments.