Hey, I'm actually surprised this isn't a thing yet. (didn't see something similar in search)
Would it be possible to have the mounts obtained from the beastmen, actually play the songs associated with the areas in whence they came?
For at least 4 of them I was thinking more along the lines below.
Bomb Palanquin - U'ghamaro Mines Music
Cavalry Drake - Zahar'ak Music
Cavalry Elbst - Sapsa Spawning Grounds Music
Laurel Goobbue - Sylphlands