I recently came across the Hang drums, and I am amazed. What incredible smooth sound they make. They are developed by PANArt in Switzerland.

One the best "hang" artist is Manu Delago (as featured in the first video below). You can find more about his work on his website, including several albums.
Here is how it sounds:
BTW: If you are thinking of buying one, then you might find it to be very difficult. They are apparently as exclusive as special edition Ferraris.
(via Manu Delago)
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