Do you have to know the lyrics to the songs you are listening to? Or is it okay if you can't understand what the singer is singing?

I can go either way sometimes. Sometimes I am ocd about it and have to know all of the lyrics, other times I think it is better that I can’t figure out some of them because it makes it mysterious and it is like a game trying to figure them out (which makes me want to listen to the song more often and probably adds to the replay value). So what are you like? Have to know or don’t care?