I dont think this is a big deal.
considering how many artist there are (and I dont mean japan only), and how many songs have been produced in the past decade alone, it would be a coincidence if a certain melody wouldnt have been composed already.
at least thats what I think... but I still hope either that this song was not composed by GEO or that GEO at least aint german (heard that somewhere)...
that would be another disgrace to bear...