I sometimes find myself muttering along to the music that has "lyrics" of sorts, like the themes in Ulduar, Lion's Landing, etc.I know it's typically nonsense made-up language, sometimes with hints of real Latin, but I wish they'd release the words to the public so I'm not blathering like an idiot with what I think sounds right, haha.

I didn't find the right solution from the Internet.

References:
http://www.mmo-champion.com/threads/1337457-Anyone-still-do-this-when-they-hear-the-ingame-music-they-like

App Intro Examples