So I had these songs in my itunes library and on my iPhone. The last time I synced them was maybe a couple of months ago. Well I delete the songs out of my library and iPhone and try to readd them using the exact same MP3's. This time, however, the songs won't go into iTunes. Not even an error message. Just when I try to add them it appears as if nothing happens. The songs sound fine, and chkdsk on the drive shows no corruption. If I add the songs to my iPhone using Sharepod (an iTunes alternative), they add and play just fine. Does anyone have any idea why this may be occurring?