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.