You know how after you've been playing the game for quite a while you'll notice that some map musics sound very similar? Like Bright Crucible and Dark Crucible, Guardian of ice to the Castle of grief to the hidden song Chap_2r, Seven portals to dragon chapel, etc....
The only other game I know of that did this was Earthbound (mother 2), and I think it's kind of a cool thing. and I... well, I just felt like making a topic about it that's all.