Kudüm is one of the most fundamental rhythm instruments in classical Turkish music. The personplaying it is called kudümzen. It is among ney, rebap, and halile as one of thefour main instruments in Mevlevi music. It consists of a pair of small, hemispherical drums. Traditionally kudüm was played in religiousceremonies; in a secular context, like in mehter music, its slightly bigger cousin nakkare is played.