1920's. An Ainu woman playing the Mukkuri (ムックリ, a Jew’s harp). The Mukkuri is a traditional Ainu musical instrument played by women. It is made of carefully cut bamboo with two strings, and measures about 10 by 1.5 cm (3.9 by 0.6 inches). The player vibrates the tongue cut out of the bamboo by pulling one of the strings, while holding the instrument in front of the mouth. Volume and tone colors are changed by changing the shape of the mouth.