I've released my first Cinder-based music toy a couple of weeks ago – and I couldn't share it earlier due to being away from home and locked out of my account due to two-factor authentication, but I digress. The app in itself is pretty simple, but it comes from a long three-years stint (aka, my PhD) in which I studied music education apps, and learned the value of keeping them super-simple. I imagine the app can be used in itself to just play around, but can also be used by kids and parents together – there's an argument that says that, being exposed to certain patterns, make you sensitized to them, hence the somewhat "limited" scales should pass on the notion of "notes that sound right". Lots of retrospective stuffing, here :)