Problem facing in Simon game

I have to use a error sound in my project. But I am not getting any direct link of audio file. So please tell me about a site from where I can directly use the sound.

You could link to and use the sound clips provided in the problem statement.

var audio = new Audio('https://s3.amazonaws.com/freecodecamp/simonSound1.mp3')

audio.play();

Why is there no “error” sound included with the simon game challenge. Where does the error sound in the example come from?