HDPiano for augmented reality on the Magic Leap is one of the more noteworthy AR applications I've come across so far. For one thing, it's immediately understandable ("Oh, learn how to play piano in AR!"), and potentially cost effective. (What's the cost of IRL piano lessons, $50-75/hour?) For another, much like Jeri Ellsworth's approach to AR, it doesn't assume there's a market that's inherently interested in wearing augmented reality glasses, but goes after an existing market.

The project is the brainchild of Dan Collins, whose YouTube tutorials for playing piano has earned over 1 million subscribers. (Like I said, there's that existing market.)

"[When w]e think about the future of learning we see AR as a mighty force," Collins tells me. "This in mind, we sought out to 'see what's possible' today and plan for a future where every consumer has an AR wearable that might become a part of their time at the piano."

Fortunately for him, Collins (who's based in Wisconsin) Googled around for a local AR developer to help create this app, and found the perfect person nearby -- pioneering AR/VR developer Jon Brouchoud of Arch Virtual, who's been helping create music applications in virtual world/VR technology since at least back during his Second Life heyday: