כָּל־אֵ֣לֶּה עַל־יְדֵי֩ אֲבִיהֶ֨ם בַּשִּׁ֜יר בֵּ֣ית יְהוָ֗ה בִּמְצִלְתַּ֙יִם֙ נְבָלִ֣ים וְכִנֹּר֔וֹת לַעֲבֹדַ֖ת בֵּ֣ית הָאֱלֹהִ֑ים עַ֚ל יְדֵ֣י הַמֶּ֔לֶךְ (ס) אָסָ֥ף וִידוּת֖וּן וְהֵימָֽן׃
Tutti questi erano sotto la direzione del loro padre per il canto nella casa del Signore, con cembali, arpe e cetre, per il servizio della casa di Dio, sotto la direzione del re: Asaf, Iedutun e Heman.
Rashi
and with songs and with harps and with psalteries and with timbrels All of these are musical instruments, but cymbals (מְצִלְתַּיִם) were not a musical instrument, and their function was only to make sounds, like the instrument called the kettle drum, Pauken in German, which is struck with sticks to make sounds. This is implied further (15: 25): “and with resounding cymbals,” and it is written (ibid. verse 19): “And the singers: Heman, Asaph, and Ethan, with copper cymbals to resound.” And it is written further below (25:6): “with song in the House of the Lord, with cymbals, etc.,” and because of this, they are called מְצִלְתַּיִם. Similarly (Deut. 28:42): “... the locusts (הַצְּלָצַל) will inherit.” This is a species of locust that makes a sound, as it is written in the prophecy of Joel (2:5) about the locusts: “Like the sound of chariots on the mountaintops, they will leap, etc.”