iTunes 3 does an excellent job of automatically synchronizing its music folder to its library. A great example of this is the 'Copy files to iTunes music folder when adding to library' option in the Preferences.
But what if sometimes you don't want a song automatically copied to your library, but just added to the playlist instead? Simply hold down 'alt' (also labeled the Option key on some keyboards) as you drag the file(s) from the Finder into iTunes, and it will do the opposite of the option selected in the Preferences.
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