It doesn't even work for most instruments, nearly every instrument can sound differently depending on how you play it. A violin sounds different depending on how close the bow is to the bridge, a piano sounds different depending on which pedals are pressed and whether the lid is open, a trumpet sounds different depending on whether there is a cup in front of it and where. Experienced musicians know how to use these effects to create the right feeling.

And that's only based on how little I know about this.