Smule calls their latest iPhone app “an instrument, a game, and a huge global social experience.” Most App Store reviewers simply call it “addictive.” And give it 5 stars. Like Ocarina, Leaf Trombone lets you turn iPhone or iPod touch into a musical instrument; this time, a trombone. But Leaf Trombone also lets you play for — and get instant reviews from — a global audience of fellow Leaf Trombone players. Ready to take the world stage?