Erkan Oğur (pronounced) (born April 17, 1954) is a Turkish musician. A pioneer of fretless guitars, he invented the first fretless classical guitar in 1976. A composer, he has influenced many musicians with his compositions combining the sounds of Turkish folk music and classical music with the ancient traditional music. He has played many concerts all over the world. He is regarded as a master of the kopuz and bağlama lutes.

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https://en.wikipedia.org/wiki/Erkan_O%C4%9Fur