Now this is one of the strangest things ive ever encountered with my iMac and ipod Nano. The Nano is always synced with iTunes and all of the songs i have on the iMac are on the Nano as well. How can it be that there is one song existing on the Nano that does not exist on the iMac? I can see it with iTunes but when i double click on it it cannot play it and ask me to locate it! Trying to locate it using TM but not even that will not do! What am i doing wrong here?