I have slightly more than 2,000 songs in my music library and one day I opened the application and noticed all the songs were deselected. That has never happened before and I was not sure what to do so I stopped by Apple on my way home from work. When I explained the situation to an employee, he thought about it for 30 seconds and then opened iTunes on one of the Powerbooks. He tried several things and then commented, "This is the first time I've come across such a problem. I know this is not what you want to hear, but it looks like you have a whole lotta clicking to do in order to put all those check marks back. Sorry I couldn't help you more." I was there for a reason ... I did not have the solution, but before I left I tried someone else. He flashed a wide smile when I told him about the first answer. We walked over to a computer and he said, "This is very simple. To deselect all the songs all you have to do is hold down the Command (or Apple) key while clicking any box, and to select them all just click any unchecked box while holding down the same key." Moral: When you receive a dubious answer or deal with one of those folks who don't like delving into anything, just shop around. The right response most likely exists.