if (global.chapter <= 1)
{
    if (global.plot <= 30)
    {
        if (!snd_is_playing(global.currentsong[1]))
        {
            global.currentsong[0] = snd_init("creepydoor.ogg");
            global.currentsong[1] = mus_loop_ext(global.currentsong[0], 1, 1);
        }
    }
    if (global.plot > 30)
    {
        global.currentsong[0] = snd_init("castletown_empty.ogg");
        global.currentsong[1] = mus_loop_ext(global.currentsong[0], 1, 1);
    }
}
if (global.chapter > 2)
{
    if (!snd_is_playing(global.currentsong[1]))
    {
        global.currentsong[0] = snd_init("castletown.ogg");
        global.currentsong[1] = mus_loop_ext(global.currentsong[0], 1, 1);
    }
}