This arrangement is for harp and D tin whistle (the most standard key of whistle that most players have). You receive the tin whistle part without fingering diagrams, the same part but WITH fingering diagrams, the score, the separate harp part in case you need it, and a separate sheet which contains a comprehensive fingering chart. So if you enjoy playing the notes on the staff, there is a part for you! And if you need the diagrams for learning, or for using every time, there's a part for you!