In all of the rips of Super Mario 3D Land's soundtrack that I've seen, they've included this version of the Special World 8 theme:

Super Mario 3D Land Music - Special World 8 - YouTube (http://www.youtube.com/watch?v=TSb2R9mJ1gY)

But not the altered version that plays once you unlock the last secret level in the game. I was hoping someone could upload that version. Thanks in advance!

Yeah, I remember a version with more upbeat music.
I found this one:
Super Mario 3D Land S8 Map theme 2 (S-8 Crown ) (HQ) - YouTube (http://www.youtube.com/watch?v=pcWP8UNfOos)

Hope I helped

Take a page and a pen, draw a big mushroom,
Add an egg, then two more.
Draw a cloud under here, now we'll add some coins,
One two three, one two three..

Wow, that's perfect! Thanks for sharing!