Q: I preordered an album, and it's greeted out and says purchased but I won't download. And it's not in my library? What can I do

Hi Doomstick,

Thanks for using Apple Support Communities.  This article has some information about pre-orders and how to download them:

iTunes Store: About pre-orders

http://support.apple.com/kb/ht5714

However, if that doesn't work for you, this article has instructions for downloading items already purchased again:

Downloading past purchases from the App Store, iBookstore, and iTunes Store

http://support.apple.com/kb/ht2519

Cheers,

- Ari