As snakerunners said, standardize is just a bonus to the apocalypse, since I figured songs of the damned is more than enough to pay for it. I don't really like Cellar Door. I find it too slow and unsure for my taste. The point is more to put most of the deck in the grave fast than to slowly mill yourself. I wouldn't mind taking a look at that deck, but I really don't know anything about Commander format.
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I think the death pit offering is a good way to spend the extra mana that song will give, and add a little edge to the weakest zombies. Drainu is risky, which is why there's only one. It's more about the possibility of playing a song from the grave, or play one song two times. Since the deck revolves around the songs and the apocalypse, taking them out would kinda break the speed of the deck, which is dangerous with mesmeric orb out.