I love the Twilight Highlands music. It's just so full of despair and tragedy, just like the despair that the Old Gods and their minions leave behind wherever they go.
Fun fact: The twilights hammer was created by Cho’Gall and orcs that we’re corrupted by the void known as the pale. By the time of classic, all of the pale died and no one really knows why.
This is probably my favorite channel on youtube! You go above and beyond and the quality of these videos shows it! It's really nice to see someone who is clearly passionate about this music.
Go here and download WoW Model Viewer: wowmodelviewer.net/wordpress/?page_id=27 Then install it, run it, and once it's done loading, there should be a tab in the bottom left corner that says "Models (.m2)". Click on it and select "MP3s (*.mp3)". Then go to "Sound/Music/draenor" and you should be able to save all of the music there. Keep in mind though, that you're only able to right click and save one at a time, you can't save multiple files or save the entire folder so it'll probably get a little tedious, but this is the easiest way I've come across in getting all of the Warlords of Draenor and other tracks from the game directly (remember that there are other tons of folders from different expansions that you can do this with). Alright, good luck!
Oops, kind copy and pasted this so when I'm talking about the "draenor" folder just replace "draenor" with "cataclysm" and your Twilight's Hammer music should be in there.