У вашего броузера проблема в совместимости с HTML5
Check how far you can get recognizing the notes using either your relative or you perfect pitch. Keep training every day until you get get them all right. IT IS MAINLY A RELATIVE PITCH TEST, the reason we include the phrase "perfect pitch" is that a person with certain degree of perfect pitch will also perform well on this test. If you pass this test successfully you would have use one or both abilities. Relative is the ability of recognizing a note after you heard a different note that you will use as reference to work out the identity of the latter.