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		 I'm assuming your on a Mac (or that the preferences are cross platform). 
 
Under Preferences, click the "Advanced" icon and you'll see "iTunes Music folder location", click the "Change" button and choose a new folder. 
 
I've never moved my entire library like that so I don't know if iTunes will copy everything to the new folder for you or if you'll need to do it.  Should be a piece of cake either way. 
		
		
		
		
		
		
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