I actually tried that event on the server music that I had, but it wasn't working. Does the event work for yours?
Works for me, but from it looks like you can't play the music from a list.
v3:
+ Fixed setServerMusic event (make sure you do not have the other server music add-on in!)
+ You can now allow people to vote for music by /SMusic, it's disabled by default but the only way to enable it right now is:
$Pref::Server::SM::Enabled/sMusic is a base command for the mod which can tell you commands if you are able to see them.