i'd like to burn an MP3 disc to play in my new stereo that says it supports mp3s. I selected that option in itunes and created a playlist. i read that it will only burn MP3 format, all others will be ignored. the problem is all my songs are in AAC and when i try to burn, i get a message saying that nothing is in my playlistthat can be burned. how do i temporarily convert songs in a playlist to MP3. any advice? thanks