I enjoy Sigur Ros to but I don’t understand them either. In fact, a number of their songs no one understands but people still love their music, I know I do (I have all their albums + DVD except Von (sadly)). I also enjoy some in German artists (Matthias Reim and the somewhat cheesy DJ Otzi) as well as the Italian songs by Eiffel 65. I also enjoy the lyric less songs of Boards of Canada, Aphex Twin, The Flashbulb, u-Ziq and M83. I also enjoy the likes of Deep Forest in which their songs consist mainly of chants from around the world. Really cool stuff, and what about Enya, she’s made some cool music with lyrics I can’t understand.
I’m not saying that lyrics aren’t important however, some artists write up some wonderful lyrics, for example this site has taken that concept and made a cool site out of it. There are some songs I’ve loved for a long time and then I’ve listened to the lyrics and realised what they’re actually singing about, sometimes it can be disturbing. Other times the lyrics are a large part of the song and it’s really nice to sing along to, or listen to. I guess it varies from song to song. I know I enjoy music immensely. Lyrics or not :)