And in classical music we can follow these changes very, very accurately because of the music's powerful silent partner, the way it's been passed on: notation.
在古典音乐中，我们可以非常准确的寻找这些变化的轨迹 这是音乐有一个默默无闻，但是很强大的伙伴， 这就是音乐得以流传的方式：乐谱。