I have some MP3s not many but I'd like to change them to AAC. I've re-ripped my music library to AAC format from when I moved from Windows to Mac. I have a few albums ripped (probably 10-15) I cant find my CDs for. Is there a way within iTunes to locate all MP3's and convert them to AAC? I'd like to beable to do this and delete the MP3s instead of keeping a copy. They are higher quality MP3s so if I lose a little quality I'm okay with it. I guess its a little OCD, but i'd like to have my entire library in AAC. Thanks in Advance!