In this video by Rabbi Jeremy Gimpel he gives insights into the prophets calling on the mountains of Israel to sing.  What does the phrase “mountains, sing unto the Lord” mean anyway? How do mountains sing?

It is the end of an era. In this episode Rav Mike explores rabbinic chronology, textual evolution and socio-political context in order to illustrate the shift between the time of the Tanaim and the time of the Amoraim.