So I was playing today, and I remembered how there's a mini jukebox room beneath the zombie spawn, and so I thought, it'd be cool if zombies had a black ops zombies theme song, and this is actually possible, or so I hope. If Calcium or any other coder/manger of plugins can work with this, then it should be quite easy. First off though, Instead of having just a normal theme playing, it'd be in noteblocks. Noteblock-ify the song: http://www.stuffbydavid.com/mcnbs With this little program you can change specific files into NBS files, which will also generate a note block version of the song, now this is where Calcium or someone else comes in, if they can code it so said music file can play within zombies on repeat, then this will allow players to get more of a chilled spine when playing, it's a lot better than hearing the normal 'happy' music minecraft has when slaying zombies haha. The theme song can be found on youtube, how to get the specific file I have no idea, I think if you find the requires files name you could google how to do it.