A single-stringed musical instrument used in the Balkans. Some two-string regional variations also exist.

A bow made of horsetail is pulled over the string, creating a dramatic and sharp sound, very expressive and rather difficult to master. The gusle consists of a wooden sound box, the maple being considered as the best material, covered with an animal skin and a neck with an intricately carved head. It is held between the legs with the long neck supported on one thigh.