Inspired by Londinium, and RateYourMusic's genre database & hierarchy, I've made an updated hierarchy file based on RateYourMusic's hierarchy. It's accurate as of 15th-20th June 2021, so since Londinium's file, it has some new genres (notably White Voice, ASMR and Festival Progressive House) as well as some re-organised ones.
As for the descriptor system, RYM is moving some genres to the Descriptor system (e.g. Satire, Orchestral, A capella, Holiday Music) however right now as of posting this, part of the policy regarding their genre queue is that
no genres can be removed at all, so genres that will eventually be removed and sent to the descriptor system have been given the
Descriptor genre as a parent. Like Londinium's file, I've added the Descriptor genre and it subgenres as well.
I aim to keep it as updated as possible, especially since I use RateYourMusic for genre classification (I help with genre voting when I can).
https://gitlab.com/Flaky/mb-rym-hierarchy