i was putting a couple songs onto my ipod and then an upload popup came up. i uploaded the ipod and and took out the usb. wen i went into the list of my songs the songs were gone, and i plugged the ipod back into the computer and all of the songs i had were still on the ipod whenver i clicked on "my music" on the ipod through itunes but i dont know why the songs arent showing up on the actual ipod. has this ever happened to anyone? is there a way i can get all the songs to show up on the ipod again?