When I got home, I wanted to transfer my purchased music to my computer. Of course Apple has a problem with this. Purchased songs don't even show up in Rhythmbox. Here is a simple way to transfer your purchased music.
Browse to Purchases on your IPhone/IPod Touch.


This is where my song is. It is named "260927173-30001436599842.m4a". All I have to do is copy this file to my machine and rename it. You can also grab the album artwork as well.