Q: itunes is authorized, but none of my purchased items are there

Hello there, maroon5fan.

The following Knowledge Base article provides some great recommendations when content may seem to go missing in iTunes:

No content shows up in iTunes after updating

http://support.apple.com/kb/TS1967

If the initial recommendations don't help resolve your issue, the additional links also provide a great resource for additional troubleshooting.

Additionally if you don't want to troubleshoot further, you may just want to download your purchases again using the information found here:

Download past purchases

http://support.apple.com/kb/HT2519

Thanks for reaching out to Apple Support Communities.

Cheers,

Pedro.