AAC 1 - MP3 0
Looking at the small print in the recent Apple / EMI announcment about DRM free music it seems that the music file of choice will be Apple's AAC, and not the previously universal MP3. Why?
Well, recently Microsoft got hit by a massive lawsuit alleging copyright infringement over the technical rights to the MP3 codec. Perhaps neither Apple nor EMI fancied being hit in the same way.
Maybe EMI saw this as another way of controlling the distribution of their tracks. Maybe the thinking was MP3 is synonymous with those evil file sharing pirates, so AAC could be 'safer' in that respect.
I originally thought this was a simple marketing ploy to enable Apple to market their products (ie iTunes Music Store tracks) to Zune and the users of other MP3 players. It's more than that, each MP3 manufacturer will come under pressure to release firmware updates to support AAC on their players. users will have to find the upgrade, download it, apply it to their machine - how many will just not bother and buy a new iPod instead?
At a sweep Apple and EMI may have changed the drift of digital music. Where once MP3 was seen as the universal standard that accolade could fall to AAC.