Do you think songs sound better when you don't understand the language the singer is singing in? I remember I used to like some songs when I didn't know much English, but when I looked up the lyrics...
I also really like some songs in foreign languages I don't understand, e.g. Dernière Danse by Indila. I think the charm of this song would disappear if I understood the lyrics.

I like knowing the lyrics. It gives me a full understanding of the songs intentions.

It depends on the song. 90% of the time, I wanna know the lyrics
But when the lyrics are atrociously written.....