Amos 6:5 Midrash

הַפֹּרְטִ֖ים עַל־פִּ֣י הַנָּ֑בֶל כְּדָוִ֕יד חָשְׁב֥וּ לָהֶ֖ם כְּלֵי־שִֽׁיר׃

That thrum on the psaltery, That devise for themselves instruments of music, like David;

Read midrashic interpretation of Amos 6:5: and classical rabbinic exegesis.