I hope someone can give me an answer on this. I have spent some time encoding cds to .mp4 using QT being under the impression they will play in iTunes (it is said to play "audio only movies") anyway, I finally decided to try but they will not play on my G3 iMac running OS9.2 and iTunes 2. Can someone thell me if they will play in iTunes 3 in OSX (I have ordered a new iMac 800). I hope they do because otherwise I will have to re-encode into mp3. I really wanted high quality, that is why I was thinking mp4, even though I liked the quality of Ogg Vorbis better I wanted to use itunes (love that program)