If your ocarina has more than 4 holes on the top, or if the holes are all the same size, then you will not be able to use Play your Ocarina books. All Ocarina Workshop ocarinas are precision-designed and tuned to play a full octave of notes following the methods shown in Play your Ocarina books. Other ocarinas are not tuned in the same way and are sometimes not tuned at all. Where there is no method, just blow and hope!!