/**
     * Checks if given sound is being played.
     * @param res
     *        The sound that is checked for. Format: {@code isSoundPlaying(new ResourceLocation("modid:mySound")}
     */
    public static boolean isSoundPlaying(ResourceLocation res)
    {
        HashBiMap<String, ISound> playing = null;
        SoundManager manager = null;
        try
        {
            // handler -> manager -> playingList

            // gets SoundHandler
            net.minecraft.client.audio.SoundHandler handler;
            Field field_handler = Minecraft.class.getDeclaredField("mcSoundHandler");
            field_handler.setAccessible(true);
            handler = (net.minecraft.client.audio.SoundHandler) field_handler.get(Minecraft.getMinecraft());

            // gets SoundManager
            Field field_manager = net.minecraft.client.audio.SoundHandler.class.getDeclaredField("sndManager");
            field_manager.setAccessible(true);
            manager = (SoundManager) field_manager.get(handler);

            // gets playing list
            Field field_playing = SoundManager.class.getDeclaredField("playingSounds");
            field_playing.setAccessible(true);
            playing = (HashBiMap<String, ISound>) field_playing.get(manager);

        }
        catch (Exception ex)
        {
            // ex.printStackTrace();
        }

        if (playing != null)
        {
            ISound[] array_playing = playing.values().toArray(new ISound[playing.values().size()]);
            for (int i = 0; i < array_playing.length; i++)
                if (array_playing[i].getPositionedSoundLocation().equals(res))
                    return true;
        }
        return false;
    }