Midrash su Lamentazioni 5:15

“The gladness of our heart has ceased; our dance has been transformed into mourning” (Lamentations 5:15).
“The gladness of our heart has ceased.” Rav Ḥisda said: Initially, when fear of the Sanhedrin was upon Israel, they would not mention an indecent matter in song. However, when the Sanhedrin ceased, they would mention indecent matters in song. Rabbi Yosei ben Rabi Avin said in the name of Rav Ḥisda: Initially when trouble would befall Israel, they would issue corresponding rulings to suspend rejoicing. When the Sanhedrin ceased, music was suspended from the feasting halls, as it is stated: “They will not drink wine with song” (Isaiah 24:9). When these and those ceased:²⁰When there was no more music, even without feasting, or feasting even without music. “The gladness of our heart has ceased; our dance has been transformed into mourning.”