I am looking for a web site to exchange piano music.

What do you mean by "exchange", please? And, are you asking about printed music or audio?

If you are talking about piano sheet music, beyond a few local music stores, no I do not know of online places, we have sold some on eBay

I am looking for a web site to exchange piano music.
I am referring to sheet music. There was a site on line at one time where you could request sheet music and who ever had it would send it over the internet. I lost track of the site. I have tons of music myself that I would be happy to share in this way.

Thanks for the reply! I have gotten piano sheet music off the Internet. But, it is in the public domain so it was okay to be distributed for free or for a small fee.

What kind of sheet music is it that you are talking about? Classical of some kind, jazz or more modern styles of music?