It's really not that hard a process getting an entry up on BMD and yet I'm constantly getting incomplete submissions. Check out this video i threw together so you can do it the right way if you're a musician who's trying to get on there.
I encourage other musician to get their own profiles up on THIS wiki, but until THAT happens BMD will always have the most information you can likely find in one place about the brony music community. If you haven't checked it out yet, please do. ;)