וַתֹּ֤אמֶר לָהֶם֙ הַגֶּ֔פֶן הֶחֳדַ֙לְתִּי֙ אֶת־תִּ֣ירוֹשִׁ֔י הַֽמְשַׂמֵּ֥חַ אֱלֹהִ֖ים וַאֲנָשִׁ֑ים וְהָ֣לַכְתִּ֔י לָנ֖וּעַ עַל־הָעֵצִֽים׃
Rashi on Judges
Which brings joy to God. As the Levi'im chant the hymns of glory only during the wine libation ceremony.8Berachos, 35:b.