If there was a way, perhaps in Emplode, to create our own "Genre trees" we could choose the style of music with a higher granularity... as specific as one would want to take the time to create?

You can get some of this today. You are not restricted to a predefined list of genres, you can put anything you want into the genre field (this applies to emplode and id3v2 tags but not id3v1 tags). So you can have "Funk Pop" and "Funky Groove" genres if you want. You wouldn't be able to just search for "Funk" and have both of them come up, though.

Borislav