The Tapan reference article from the English Wikipedia on 24-Apr-2004
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Tapan

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A tapan is a huge round drum originating in Greece and the Middle East. It was used in ceremonies in ancient Greece such as religious festivals, or war marches such as the Greek warrior Alexander the Great's army. It has a deep sound and is made of wood and animal skin.

A tapan or davul is commonly used in bulgarian folk music as well as in turkish folk music