I started a teamspeak practice server for people to listen to one another play, just chit-chat, even possibly jam session(headphones required or you'll burst everyone's eardrums with all the feedback.)

You can get the client at http://www.teamspeak.com/?page.....ownloads 

There are clients for pc, mac, iphone, and android phones. 

Server info is: ts21.gameservers.com:9302

After you get the client for teamspeak3 installed, please go to  settings > options > capture > and select push-to-talk if it's not already default. If you click the box next to it, the next button you hit will be assigned as your push-to-talk button. This does exactly what it sounds like, you push and others can hear you. If you go in a private practice room, you can change it to continuous transmission in order for the other person to hear you playing.

There is currently a 10 person limit, because i have no idea if anyone will even like this idea. This is an experiment so leave feedback about the idea. Teamspeak is primarily used for voice chat, so they may have voice recognition and noise cancellation in the software that could interfere with hearing violin sounds. Let me know. The quality for voice is very high normally.