The pku, alternatively spelled pzuk, is an Armenian musical instrument, similar to a clarinet. It has been called the national instrument of Armenia. The pku is a single-reed aerophone with seven holes and a one octave range with the open cone of a bull horn at one end.

The pku is an ancient musical instrument, originating from the 5th century. Today a few types of the instrument are known in Armenia, which are the timbre supplementation of each other and have rather high diapason. The instrument consists of a pipe and a reed. A horn prepared from a cow’s horn is fixed to the lower part of the pipe. The reed is prepared from ebonite and a cane mouthpiece. The mouthpiece can produce shrill or soft sounds. The instrument can be prepared in different keys – in C, A, D, F, B, etc.