I Chronicles 15:19 Midrash

וְהַמְשֹׁ֣רְרִ֔ים הֵימָ֥ן אָסָ֖ף וְאֵיתָ֑ן בִּמְצִלְתַּ֥יִם נְחֹ֖שֶׁת לְהַשְׁמִֽיעַ׃

So the singers, Heman, Asaph, and Ethan [, were appointed], with cymbals of brass to sound aloud;