Sounds like a cute idea. If only the videos would load, or play, or something.
You need to “unmute” each video in-turn in order to hear the soundtrack.
Click on a video and then click on the speaker with the ‘x’ next to in the bottom right corner. Be careful, if the volume on your computer is turned up it will be LOUD.
At least that’s how it worked on my machine.
You have to unmute each one as you listen to it.