Morzart's CD is popular in Japan because it's believed to activate brain fuction.There is one unique Morzart CD that not only contains normal speed of it but also it's double,four times,eight times,sixteen times and thirty-two times faster speed of it.The faster you listen,the more your brain may be activated according to who developed that product.One day I gave a math question to my wife, who always listen to it,to see if the CD really took effect.Q:When you listen to all kinds of speed,how much time it takes compared with when you listen only a normal speed of it? I'm afraid the CD seems to have no effect to my wife because she couldn'T give right answer.