Do you listen to any bands with lyrics in a language that you completely don't understand? If so, do you still bother to learn the lyrics and their meaning? I know this has been done before, but I'm bored so fuck me.
I listen to some bands with Finnish lyrics: Mokoma, Moonsorrow, Children of Boredom.
Swedish: Finntroll, Therion(some songs in Swe, some in Babylonian or some other shit?).
Polish: Vader have some songs in Polish.
Norwegian: Darkthrone, old Dimmu Borgir, Storm, Borknagar, Vintersorg.
German: Rammstein(how surprising), Nargaroth(krieg, bitches!), Sodom, Destruction, Kreator(some songs are in Ger).
Japanese: Asian Kung-Fu Generation... (all the Jap metal bands I know have English lyrics...), bunch of pop songs from anime I don't listen to anymore...
Those are all I can think of. I do memorize/read most of the lyrics(mostly phonetically, as I can't be bothered to learn how to pronounce all those symbols in Swe/Nor/Fin, but I think I can pronounce most words correctly now), but I don't always bother to look for their meaning. I know a hefty amount of Rammstein, Storm, AKFG, Finntroll, and Vingersorg lyrics... but I don't know the meaning to all of the lyrics, just some Finntroll, Vintersorg, and Ramm.
Edit: I think this would also be a good place where to request translations from people that do speak such languages. I wouldn't mind translating any lyrics in Spanish, I can also give an accurate translation from French unless it's something deeply philosophical.