The carefree drum, also known as the hollow drum, is a kind of steel tongue drum. It is a new type of percussion instrument that sounds when the dish-shaped steel tongue vibrates. It has the comprehensive characteristics of hand disc [1], Marimba, wood tongue drum, etc. (instruments that mainly rely on the sound tongue to drive the vibration of the resonant cavity). Is a collection of philosophy, religion, culture, art, integration of modern technology, sound theory and innovative design in one of the emerging Musical Instruments.