The Harp is the famous magical instrument of gold in the story of Jack and the Beanstalk.
The magic harp plays the music that renews the land and inspires Gallaga to lay the eggs of gold. However the harp was stolen-- along with Gallaga-- from Thunderdell by Jack. It was not until years later that Jack's descendant returned the harp to the giants.
The harp was a fully computer animated character brought to life by the Jim Henson Creature Shop.