Kermanshah horn: Double-layer instruments with double sound tubes are instruments that are made of a wide part of a special straw and are doubled. horn, Karna and ballaban are among these instruments. horn have a sound tube with a funnel or trumpet. The Karna differ from the horn in terms of shape, structure, the range of sound, and the type of material used. In some parts of Iran, horn is known as Saz, which is common in all parts of Iran except Turkmen Sahara. In the western regions of Iran, such as Kurdistan, Kermanshah, Ilam, Lorestan and the Zagros regions, horn has a similar technique and structure. Appearance: Cylindrical body: The body of the cylinder is made of wood with seven holes in the front and one hole in the back. Trumpet- shaped opening: It is made of same material used for body and is limited. Pins: Made of brass and connected to the body with the help of two branches or pliers. The other side of the shaft is located in the upper hole of the body. clamp: It is made of wood and has a tubular shape that connects the desire to the body. In fact, the tongs are placed on the top and inside the sound bar and the rod is mounted on it. it plays an important role in the chromatic property of horn’s sound. Tongue: It is made of straw and is attached to the upper part of the shaft. Lipstick: Made of wood, metal, shell, plastic or bone. The lipstick has a hole in the middle that is where the pin passes and stabilizes the instrument in the musician's mouth. Executive technique: Serena's performance technique is breath-taking, and due to its large size, it has a more limited and low-pitched sound range, which can be changed by changing the blowing pressure and the way the fingers are fingerprinted. administration: At weddings, cheers and celebrations are played, Chamary funeral which is a form of mourning. Among the nomads,was used to wake up the people. It is used in the performance of Garan, Chapi, Se Jar and Fatapashaei dance songs. Also, in performing Maghams such as: Jangheh, Jolushhahi, Khan Amiri, Sarokhani, Savar Savar and Sahari will be played with drum.