See this (rather long) thread on the "featuring" problem: /t/11096/1
My opinion on any standardization: it has to be unique in one library. I would not care what others do. You set the standard for your collection and that's it.
If you want to go with the ID3 standard for V1 genres: it is Rock ’n’ Roll. See this wikipedia page: https://de.wikipedia.org/wiki/Liste_der_ID3v1-Genres