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 концерт in Япония they can sing their songs by translating it into japanese version.... ahm, i think thats all... ::)))

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