Musyc is a confounding app--part game, part musical instrument, and part music exploration. You can create a collection of sounds by dragging and dropping shapes onto other shapes, moving them about the screen, catching them, and creating chains that work in tandem to create those noises. It's simultaneously fun to experience and a little confusing, even after the rather detailed tutorial.
When you first open Musyc it will not be apparent what or how to use the app. So you should always start with the tutorial. Even from there, the game is a little confusing, so you should experiment with using what you've been shown. While the learning curve can be frustrating, the app, itself, is exceptionally well made. This is a very cool app--it works well once you get the hang of it, plays well, and the things you can do with percussion sounds are kind of incredible. Timing the placement and response of each onscreen element is not easy, and the functions that allow you to move those items around the screen are even more frustrating at times; but when you get it just right, the results are extremely satisfying.
If you enjoy making music or simply want to experiment with an app that takes music seriously as a gameplay element, then download Musyc. It will take some time to master, but the results are almost always worth that extra time investment.