I noticed this about a year ago. So, there are some songs that I cannot play in iTunes, on either my laptop or home computer. However, I can play them on my iPhone 3GS and my 3rd Generation iPod after being sync'd. A friend thought that it was perhaps these songs/albums were not "official" Apple iTunes downloads or not direct downloads from CDs. This is not correct, random songs from random mp3 sources including iTunes (Apple iTunes Store), and even complete albums (from CDs) are affected. Why is this? how can I correct this? Anyone, please advise!!! Thanks!!!