Jaw Harp Also known as the Jews' Harp, the Jaws Harp is a hand-sized instrument placed in front of the mouth. Its name is misleading, as the Jews' Harp is neither a harp nor associated with Jewish tradition. It has a long history, and has remained popular because it is portable and relatively easy to play. Each jaw harp is hand tuned, and packaged in a poly bay with a history and instruction insert. Antique 1800s ornate cast iron jaw harp.