The ancient Greeks built theaters with acoustics that allowed actors to be heard all the way in the back and opera singers used crazy vocal techniques to project their voices at frequencies that could be heard over the orchestra.

古希腊人建造了带有声学效果的剧院，让演员在后台一直都能听到，歌剧演员使用疯狂的发声技巧将他们的声音投射到可以在管弦乐队中听到的频率。