So apparently when you buy a new computer, log in, and authorize your computer with the store and then click "check for available downloads" it won't find any of the stuff you've bought on it in the past on a different computer, so you lose everything you've bought.
Anyway around this? Google isn't helping and apple customer service is shit.
Glad I've only spent about $50 on the store in the past 4 years.
You can't re-download your songs. It's not XBL or PSN. You need to back them up.
As an FYI, there's is no legit music download service that lets you re-download purchased songs. RIAA won't allow it. Apple will make a special exception in the case of data loss, but it is for one time only. Amazon is the same way.
Authorizations are tricky. What it does is allow you to play DRM'ed files on your new computer. The new iTunes Plus songs aren' DRM'ed, but older songs and media--movies and tv shows are. When you authorize your computer, your allowing it to play the DRM'ed content.
Yeah, dude, it works nothing like Steam, XBL, PSN, or even WiiWare. The RIAA negotiated these terms with all online music marketplaces--Amazon, eMusic, Zune, etc. So it you do buy MP3s, you need to back them up.
I'm moving more to streaming services--Pandora, Rhapsody, etc., because of this. I don't really need to own tons of music since the streaming services have amazing selections.
Did you back up your MP3? If not you should be able to burn them to a DVD and move them over to your new machine.