What Is The Most Important Musical Invention?

           What do you regard as the most important musical invention? I had an interesting realization that I want to share. But first, I want to know what you think! So how about it? 

           Would you say harmony? The orchestra? The symphony? Is it recording technology? Is it—the viola? 

           What do you consider the most significant technological musical advance? I know you people—those who follow these webmails. You're a wonderful and strange bunch with unconventional thinking. Surprise us! Just click on this blog link and share your comment.