A local Montana drummer performing a drum solo with hammers on harmonically balanced rocks at Ringing Rock State Park near Butte Montana at the Pipestone exit. This is one of two such formations in the world where you can find harmonically balanced rocks that resonate in this manner. When you strike the rocks with any hard object they sound a tone that varies based on the shape of the stone and the placement of the stone in the pile.
http://youtu.be/V91dkxp_XhI
