This is a demo of Smule’s Leaf Trombone: World Stage (App Store link), which takes advantage of the latest features of the iPhone operating system.

“Without the iPhone, there would be no Smule,” said Dr. Ge Wang, co-founder and Chief Creative Officer of Smule, and Assistant Professor at Stanford’s Center for Computer Research in Music and Acoustics (CCRMA). “And without iPhone OS 3.0, there would be no leaf trombone duets on the world stage.”

Leaf Trombone World Stage is the first massively multi-player musical game, and was designed from the ground-up to take advantage of all the iPhone offers, including multi-touch, location services, full-time data access, and real-time graphics.