I like the discussion here and moreover, I'd be happy to hop on a call or two to hear even more, in the meantime happy to address a few things.
The reason price was cut from $10 to $2 (for images) is because the stock assets market has shifted significantly since 7 years ago when we partnered with Getty and the idea is that as Fiverr we'll provide our buyers and sellers attractive prices for such assets, without having to pump up Gig prices. You're free to price your Gig any way you want and factor in any additional costs that go into your work. When you had Background music as part of your Gig you probably did that too, regardless of where you sourced your music from. Now about Gig extras - yes, for a number of reasons, this has to be a fixed price which is why I strongly recommend you include licensed music as part of your Gig packages. I mentioned before, but in the future, this will allow buyers look for assets too, and save you time as well.
Can you remind in which category you're offering your services, is it Logo Animation? if so - I believe you should be able to include music as part of your Gig packages, it can't be a ticked type because it's a numeric item.