The Xylobands were created by Coldplay?, (Mylo XYLOto = Xylobands) or it's just a coincidence? Because I know other artists had used them too. It was the original Coldplay's idea?
It's not a coincidence, no, but Coldplay didn't come up with the idea. You can find out how it all came about by reading the interview with the inventor, Jason Regler here.