I just went to eBay and looked at the Record Category. I don't see a Sub-genre option. As we pull our item specifics directly from eBay it could be that they have changed what they want in that category and no longer offer sub-genre.
I did compare our "Genre" list with eBay's and it looks to be identical to me.
I do see "Style" that has a large number of options, but it doesn't seem to be tied to the Genre. When I change the Genre option on eBay it does not affect the Style options.
eBay hides their complete list by only providing a partial list of checkboxes and then includes a dropdown to add any of the others. We have a full list of options as checkboxes.