I remember reading about a very similar experiment with Joshua Bell, a violinist whose importance is, I'm assured, beyond dispute.

It's a good way to question the validity of art criticism, but again, has flaws - these people are busy!

Here's a write up in the Washington Post about it [url=http://www.washingtonpost.com/wp-dyn/content/article/2007/04/04/AR2007040401721.html[/url]