Help getting background music that plays through all slides?

I've been working on this for a couple of days and have found several posts in the forum already, but there doesn't seem to be one recently so I thought I would bring it up again.

I'm working on an interactive video in Storyline 360 and would like to have music that plays independently of the slides. I'd also like the music to loop so it plays for as long as the learner is watching/interacting with the video. I know this isn't something Storyline has in house so I've been trying to do it with Javascript.

I found a bunch of posts and tried a few things (namely this one https://community.articulate.com/discussions/building-better-courses/playing-background-music-across-all-slides-storyline-360?page=1#reply-680284), but I can't seem to get anything to work, even with the great detailed instructions.

I'm definitely not a programmer and am literally just copying and pasting the Javascript into Storyline. I did read that it might have to do with using Chrome, but I've tried opening the course in Microsoft Edge and that didn't solve the issue.

I'd love some help with this. I've attached my .story file and here is a link to a web version of the course. Any ideas on what I can do differently to get this working?