Forget iPhone apps promoting bands, or streaming music apps, or anything serious. The best iPhone music app ever (possibly) just debuted on the App Store. It’s called Leaf Trombone World Stage, and is the work of Smule, the developer behind Ocarina.In short, you play a virtual trombone. And then upload your best performances to an online server, where they’re marked out of ten (with added emoticon-based comments) from budding Simon Cowells around the world. Plus there’s a falling-notes Guitar Hero style tutorial.If all this sounds silly, well, it is a bit. But in a good way. Ocarina has been hugely popular, so if Smule reckons the future of iPhone music is trombone-shaped, we certainly aren’t about to disagree with them. The app costs
Tools: platforms to help you reach new audiences
Tools: Kaiber
In the year or so since its launch, AI startup Kaiber has been making waves,…