exit through a public venue

After watching the Banksy film Exit Through the Gift Shop, I started wondering why it is that there isn't more being done with music in the realm of public art.  Sure, there are street musicians busking in almost any town you stop but why has there not been more of an underground movement trying to experiment with different ways of exposing the general audience to music?  It seems that new composers and musicians should be pushing to get there music recognized and this, hypothetically, could be a great outlet to do so.  When you play music in a public venue it's something that people have no choice but to be exposed to.  The street musician and the cheesy pop music playing in restaurants and coffee shops are not something that you can just avoid; so why not try to exploit this "public space" to expose people to things that are worth listening to? Some cool things have been done with street art involving music, but in the sense that graffiti is an underground expression of the visually artistic community, I feel there is much more room to start experimenting with ways to expose people to the music being created by our generation through public art.

Check out this video: an example of playing with music and public art: !!
http://www.youtube.com/watch?v=2lXh2n0aPyw