Sotah9: 11
מִשֶּׁבָּטְלָה סַנְהֶדְרִין — בָּטְלָה הַשִּׁיר מִבֵּית הַמִּשְׁתָּאוֹת, שֶׁנֶּאֱמַר: ”בַּשִּׁיר לֹא יִשְׁתּוּ יָיִן וְגוֹ› ”.
From the time the Sanhedrin was abolished, song was abolished from the banquet halls, as it is stated (Isaiah 24:9): With song they will not drink wine, etc.