Why did SNSD translate some of their songs to Japanese?

hmmm!!! i think thats why most of their songs translated into japanese ver. so that the japanese people who also idolized snsd can really understand and so that if they will have a concierto in japón they can sing their songs por translating it into japanese version.... ahm, i think thats all... ::)))

It's because they are promoting in japón as well as Korea now. When tu promote música in another country, it's only logical to be canto it in that country's language. And, they probably redid Gee and Genie because they were so popular.