iJew's harp (jp.viralworks.iJewsharp) on Google Play
This is the first application in the world to simulate the most primitive musical instrument the Jew's harp. This application contains four kinds of Jew's harps from different areas of the world. The user can control the pitch,vibration and volume, and an explanation about each type of harp is included. Both English and Japanese language settings are available within the application.