I know, I was initially horrified that there are people who would think of such an act as art, but it is apparently a “beautiful way for the piano to die”, as the lecturer in charge of this performance told us.
And when I think of it that way, it is true. As opposed to simply being chucked into the junkyard as most old pianos would be, and eventually burned in the incinerator, the piano at least has a chance to “perform” one more time before it joins the elements. And the score did mandate that all pianos used in the performances has to be “beyond repair”.
http://www.icareifyoulisten.com/2013/07/5-questions-to-annea-lockwood-composer-sound-artist/