Kamanche
The kamanche instrument has four metal strings, and its body consists of a wooden hemisphere covered with a thin sheepskin membrane. The tuning varies depending on which region of the country it is being played. In Tehran, the kamanche is tuned in the same manner as a violin: G, D, A, E. It is suspected that the fourth string was added in the early twentieth century as the result of the introduction of western violin to Iran. The kamancheh can be seen included in Persian antique paintings.