Thin whistle Absolute wind instruments have holes in their reverberation tubes that produce various sounds by closing and opening them. Thin whistle is one of these group which also has an edge. In both sides of the tube are open and have a number of holes in the body. Of course, the contact angle of the edge with the lips plays an important role in the impact of air along with the pressure with the sharp edge of the body. Then The edge is located lower then the head part and the air coming from mouth hit the this edge and accelerate the sound producing by thin whistle and But in the sharp edge of the lip, the sharp edge that the air hits is located a little lower than the head of the tube and on the body, and the air is directed to the gap in the head of the body after leaving the mouth, making it easier to make a sound. Thin whistle is known as a Recorder in Western music. playing this instrument is easy so, non-professionals are also able to play it. In Iran, it is called by different names such as reeds, labak, sikatak, Shemshad, totak, sutak, and shotak. Structural features: Thin whistle consists of a few holes in front but unlike the reed doesn’t have any hole in back. The head of the thin whislt is cut in such a way that a wooden piece can be placed in its opening so that a narrow gap is created between the edge and the wooden piece. The application of the created gap is to direct the blown air to a sharp gap on the body so that the reed can be heard. Thin whistle is made of reedbeds, wood or metal pipes. Executive technique: Due to the lack of a hole in the back of the tube, it does not have a wide range of sound. But with the implementation of the breathing back technique, its sound becomes continuous and without pause. Although, even professional thin whistles have a hole in the back of the sound tube that can perform an octave and higher. Even children can easily play it because of the ease in making the sound administration: The reed is mostly played for children as an entertainment, and shepherds sometimes use it professionally. The thin whistle does not often accompany another instrument. Double thin whistle: This type of reed is common in Balochistan and is called Donali. It was originally imported from Pakistan to Balochistan. The donali is in the form of two tubes, one performing the main melody and the other is vocal. musicians: Shir Mohammad Espandar