Elvish/Sindarin, Tolkien's creation. Despite it being fictional, it's one of the most beautiful languages I've ever heard.
Klingon.
The language of Yautja Prime, of course.
tlhIngan ghoj qamuSHa'
It's Klingon.
https://www.youtube.com/watch?v=diOW4t9CIxU
Gelf might be useful.....