Ocarina is a fun and innovative app for the iPhone. It’s a “true” music instrument but also a social network of Ocarina players. You can listen to people playing the Ocarina all around the world — in real-time.

As Techcrunch wrote, this is one of the few iPhone app (see Chess with Friends) that leverage the network effect. Most apps simply don’t.

The more we see that kind of apps, the more the iPhone will be a truly unique platform.