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 সঙ্গীতানুষ্ঠান in জাপান they can sing their songs দ্বারা translating it into japanese version.... ahm, i think thats all... ::)))

It's because they are promoting in জাপান as well as Korea now. When আপনি promote সঙ্গীত in another country, it's only logical to be গান গাওয়া it in that country's language. And, they probably redid Gee and Genie because they were so popular.