When Mujik came out it was really a very different kind of music application, and to a greater degree it still is.
My guess is that it hasn’t been a massive commercial success, but if you don’t know it I think you should at least give it a go. The app is only $0.99 but there’s a free version too.
I think that it was a brave attempt at a different kind of music creation concept that was both engaging and also very tuneful. I think we should have more of these, a lot more, and I hope Lucky Frame (the developer) keep going with ideas like this.