How to add audio to a preloader animation on a website's home page?

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I have a client that wants a preloader animation when someone visits the website (available only on the first page of the site they visit). The catch is that they want audio to be available for this. I know there are apps that can be installed for the animation and that the theme.liquid can be adjusted for the same purpose, but I'm having difficulty finding a way to incorporate that audio element.

Any suggestions? Thanks in advance.