iTunes 11 and file type
So I've been back and forth with different versions of iTunes lately, because I hate the iTunes 11 interface, and I can't even remember why I last switched back to it, probably something wasn't working with an older version. But now I'm having a serious problem with it, because every single new song I add has to be converted to AAC, or it won't play all the way through on my iPod. Why is this the case? It's really frustrating, and really tedious when I have to go through and convert things and then delete the original versions.
MacBook Pro, OS X Mavericks (10.9), 17-inch