According to Plan is the opening number from Corpse Bride, and while it does have a good tune, interesting lyrics and all that, I think that a stronger opening number would be one that doesn't focus on the horrible parents. It does a good job establishing the setting of the story, but the people singing are not that pleasant.
That having been said, According to Plan is really fun to sing, and that's why it gets on the list. I know that the animation is a little strange, but I really like the look and feel of stop motion animation, and I think it looks really good in this movie.
It's a beautiful day! / It's a rather nice day.
A day for a glorious wedding!/ A rehearsal my dear, to be perfectly clear
A rehearsal for a glorious wedding!
Assuming nothing happens that we don't really know/ That nothing unexpected interferes with the show!
And that's why everything, every last little thing, every single tiny microscopic little thing must go according to plan!