There are only three Quag Harps left on the planet and one of those belongs to Mostart's grandmother. The Quag Harp is very hard to play. In fact only The Chameleon has been known to be able to play it. When played correctly, it makes a beautiful, heavenly noise. However, when played wrongly, it sounds awful, shorting out lights, sonic vehicles and generally making peoples' ears hurt. It features in the episode Summer Breeze.