I have several mp3 files that are not being accepted in iTunes, and consequently in my iPod Classic. It says that those type of files cannot be played on iTunes. However, I already had those files previously on my iPod, when I accidentally deleted them, and later uninstalled iTunes for a while if I'm not mistaken. Now when I try to put the files back, the problem appears. I thought the files might have got corrupted, but they play normally on RealPlayer, WMP and even on Quicktime. Now I know most people here are totally against piracy, so I should say the songs in question are not illegal. The album is "In Rainbows" from Radiohead, and I bought them from the official site, back when it was released and you could pay any price you wished. Also, it's not the whole album that shows this problem, only a few. Thanks in advance!