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iPhone musical application developer Smule made a name for itself when it released its Zelda-inspired Ocarina software last year to great fanfare. Boasting a simple (yet surprisingly difficult to master) interface consisting of 4 note pads (simulated finger holes), the software combined multi-touch and breath detection to make the iPhone into a very playable instrument similar to a real ocarina.

Today, Smule announced the latest and most ambitious of their iPhone/iPod Touch-based instrument apps, Leaf Trombone: World Stage. Leaf Trombone improves upon the shortcomings of Ocarina in a number of areas (like adding tutorials), and throws in a very ambitious online judgment area called World Stage.