Firstly let me feel oblique that i suggested this for sa:mp, and you turned it down because you are the owner.
The main concept of having a gaming radio on the internet, is not flawless or stupid. Therefore, it might contradict with the current deathrun music player as i remember being talked about. On the other picture, the situation seems rather dull, but i'd say, listening music on wma is one thing, listening music on radio is something else. On the radio, you are updated wit the latest pop songs from many genres, as well the events in the gaming screen. We have a current discussion about introducing the gaming news part of the station.
As for a music player, it can create effects which might interfere with the game itself. The radio itself is built to have the same sound emitting as the game. So for instance, if u are after for quiet music and for better ingame sounds that would depend of your score, you can use the radio. The player itself, can not adjust to that level and might create the unwanted effect. If people seem to be not wanting this on a server (generally), then why the station has 5 game plugins running on (and believe it or not, around over 500 servers)
The server dependence isn't much of a factor, since we can put them on all of them. There a multiple perspectives, but let me talk about this.
Jb - Commanding (Shut the music when he is commanding, or risk being killed)
Pubs - Sound factor (shut the music if you want to go serious)
What else we got?