I agree with both of you, everyone’s interpretation of genres is idiosyncratic. Perhaps it’s best not to preload a whitelist after all, then? But I’d still find it useful to have one I could fill in with my personal preferences.
Yeah, in general terms, each genre can have multiple parents, and there’s no way to say which one contributed the most, if any. But in idiosyncratic terms, I thought it’d be useful if each user personally has the ability to tag things as a specific genre and a general genre as they personally see it, and then be able to tell Picard “I personally would like you to lump everything I’ve categorised as funk and jazz-funk in together as just funk, I have ten funk albums and one jazz-funk album and it’s not worth keeping them separate”, while someone else does the opposite.
I’m flirting with tagging specific subgenres at the moment, and while it’s helping me articulate which ones I like the most, and find new music I like (great!) it also makes it harder for me to find things as I can’t remember what genre I tagged them as. (“Is this hip house or euro house? Nevermind, I’ll skip the genre and go straight to the artist.”) So I’d personally find it really useful to be able to say “just whitelist house already” as opposed to “blacklist hip house, euro house, and all the other specific houses”, so I can continue tagging things accurately as well as broadly, while keeping my Walkman’s genre list short enough to be useful.
Basically, my entire thinking here is “it’s easier to whitelist about ten genres than blacklist about a hundred ones”.