I have a friend who lost his left hand in an accident. He is a good piano player and can play good music with his right hand. I want to build a robotic machine which will be able to play notes played by the left hand. But the problem is I am not a musician, I don't know how music is composed, and I live far from him so I am can't ask him how things work. I have a basic understanding of what notes are and how they work in a mathematical sense because of a course I took on "Signal and Systems" in engineering. So, here are my questions:
What is the use of the notes played by left hand? Is it in some way a derivative of what's being played with the right hand? Can the left hand be completely independent of what's being played with right hand?