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 konzert in Japan they can sing their songs Von translating it into japanese version.... ahm, i think thats all... ::)))

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