I have and iPod Touch 4th Generation. I noticed today that although I deleted about 30 songs from my iTunes library, when I sync my iPod the songs remain on my iPod. How is this possible? Is it a glitch or am I doing something wrong? I know I can manually delete songs from my iPod by sliding on the song title and pressing delete but I don't remember every single song I deleted from my iTunes library so I might miss some songs. This is very frustrating! Any help is appreciated! Thanks!