Yes, we implemented it a year ago: This is some of the reasoning we had for removing it:
Music is definitely a thing you have to split up into genres and follow the tags like that. There's no way i'd subscribe to /r/music on reddit, but i follow a bunch of more-specific subs and find a lot of good music that way. This method doesn't work well unless everyone starts using genre-specific tags, though. It also sucks when you want to subscribe to something like "interesting music from obscure artists", where it doesn't necessarily have to fall under any specific genre. But yeah i would definitely post a lot of music to #music.syzo if i could, but otherwise i feel like i'm just shoveling on more garbage to #music and would be a good way to get me filtered.
I started posting music under both #music (or #metal) #music.CraigEllsworth, but I just removed the #music.CraigEllsworth from my music posts because the tag makes it sound like I made the music myself, when of course that's not what I mean. I suppose it would make more sense to put it back on my music posts?