public static void muteBackground(){
		// Used for loops
		int i;
		// Used so that the methods associated with a midi player can be accessed.
		MidiPlayer currentMidiPlayer;

		// Checks the slide for content
		if (null != entityPlayers )
		{
			for(i =0;i <entityPlayers.size(); i++)
			{
				// test whether the midi players are active.
				if (entityPlayers.get(i).getIsActive())
				{
					if (entityPlayers.get(i) instanceof MidiPlayer)
					{
						// Mute player
						currentMidiPlayer = (MidiPlayer) entityPlayers.get(i);
						currentMidiPlayer.muteMedia();
					}
				}
			}
		}
	}