If for any reason you find yourself with random missing tracks, (or are trying to recover from a dying hard drive like me), there is an easy way to isolate those missing tracks. 1. Create a standard playlist called "Not Missing". 2. Drag your entire library into that playlist. Missing tracks cannot be copied to a playlist. 3. Create a smart playlist called "Missing" where Playlist - is not - Not Missing. Voila! All your missing tracks with the dreaded exclamation mark are now in a playlist. You have three options: 1. Delete them 2. Reconnect them by manually finding the proper files. 3. Reimport your CDs, which will retain the ratings and playcounts, etc.