Gusle are also indirectly important to the whole of Western civilization. The Homeric Iliad and the Odyssey are the generally considered foundational works of literature of Western civilization along with the Torah and the Christian Bible. As the verses pertain to a war and events long before the abjad script was known to the Greeks, it was proposed that Homeric hymns were sung, not written, and were passed down through generations of singing epic bards, who were, like Homer, often blind. This was finally proven as probable in the 19th century when the German classicist Heinrich Schliemann discovered the gusle tradition not far from Greece after observing a Serbian bard reciting a lengthy poem in a similar style.
Source: Gusle – Wikipedia