I think the sound is a very interesting phenomenon … why the people like and are so influenced with music. They don’t know how strong the music influences us, good and bad … you can kill people with sound. And if you can kill, then you can — maybe there is also the sound which is something opposite of killing. And the distance between these two points is very big and you are free — you can choose. In art everything is possible, but everything what is made is not necessary.

-Arvo Pärt

I heard that and more on this YouTube video, where Björk interviews Arvo Pärt.