I didn't mean to claim that 100% of what could be named "musical instrument" is following perfectly the pattern, I was merely illustrating that "simple interfac

I didn't mean to claim that 100% of what could be named "musical instrument" is following perfectly the pattern, I was merely illustrating that "simple interfaces often require complex system". Another illustration, in reverse: the Chinese chopsticks are among the simplest tool you can imagine, and it requires a somewhat steep learning curve, but once mastered it is really the most powerful food grabbing tool ever invented. The Chinese brush is of the same nature: extremely simple, very hard to master, and very powerful (expressive) once mastered. Just like the violin (and VIM, and git, etc.) On the other side of the spectrum you have the synth, IDEs, Google search, etc. Simple UIs, simple to learn, but internals are very complex.