stone music

I came across this video of the Icelandic band Sigur Ros. They collected various stones and tested out their resonances and eventually assembled a marimba. The video shows them making up a song on it. I just saw this and was thinking about our class with Tian. It sounds like music as most of us would define it, but it is interesting that they just found these stones and were able to produce pleasing sounds from them. I suppose we learned from Cage's piece that anything is music, so even if they were just throwing rocks on the ground it would be "music", but I still think their nature marimba is impressive.