If your iTunes has auto-sync for music enabled, simply opening iTunes and plugging in your iPod will add any new music you've downloaded to your iPod. 3 Click your iPod Shuffle's icon. read more
Check the boxes next to the playlists, artists or genres you want to sync if you choose "Selected playlists, artists and genres." Click the "Apply" button at the bottom of the program window to sync the music to your iPod Shuffle. read more