I have yet another iTunes for Windows problem. I have a bunch of CD's I ripped to WMA format, and they all needed to be converted to M4A in order to play them on my iPhone. After nearly 20 hours of copying and converting all 2000+ of the files in iTunes, today I find out that none of the album artist info was saved on the M4A copies of the files. Because of this, under Albums, any compilation CD by various artists isn't grouped under various artists, but instead there are multiple appearances of the same album by each artist. Windows Explorer won't let me edit any metadata whatsoever for M4A format files, so I'm at a complete loss. The album artist info is there for MP3 files, but it isn't there for the converted M4A files. This makes it a pain in the neck to listen to albums on my iPhone. Please help!