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how to do
1.Manually adding and deleting songs
If you prefer to manage the songs and playlists on your iPod separately from the way you manage them in iTunes, start by setting iTunes to Manually manage the content on your iPod.
Next, Click the gray triangle icon next to your iPod in the iTunes Source pane. This will allow you to see the contents of your iPod. You can add playlists and songs store in iTunes to your iPod simply dragging them to the iPod in the Source pane.
You can remove items from the iPod by highlighting them as they appear on the iPod and choose Delete from the Edit menu.
2.Automatically adding and removing songs and playlists
When iPod is set to automatically sync all music with iTunes (default setting), songs and playlists that are added or deleted from your iTunes Library will also be added or deleted from your iPod when the iPod is connected and synced with iTunes. If your iPod is set to only sync certain playlists automatically, songs are added or removed from the iPod when they are added or removed from the playlists in iTunes that are synced to iPod1.