the latest Mythgard podcast is discussing the Shaping of Middle Earth. (i.e. Vol4 from the History of Middle Earth series).
I have read only a partial series,two I left home but three I actually found here at the used book kiosk. Alas, this volume is not one of them.
and Professor Sherman has another class on LOTR on youtube. His previous classes include LOTR, Harry Potter, and medieval English literature.