YouTube user mutlunatic playing the hang, or hang drum. From Wikipedia:

A hang (pronounced ‘hung’ or ‘hong’) is a melodious percussive musical instrument, similar to a steel drum. It uses many of the same physical principles to operate. However, since it is struck with the fingers, the sound is generally much softer than a steel drum, and can be played in many ways to produce a large variety of sounds.

Well Hang – YouTube via Neatorama