If you're a developer looking to avoid the same mistake, use "ducking"[1] to help make sure that your music bed doesn't overwhelm foreground audio. Even low-end tools like iMovie[2] support this, although the feature may be called something like "lower volume of other clips".

[1] https://en.wikipedia.org/wiki/Ducking [2] https://www.cnet.com/how-to/tips-to-become-an-imovie-master/