iTunes
How do I move music from an external hard drive to my mac
iMac, OS X 10.11
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Typically you might use iTunes > Preferences > Advanced to declare a new media folder where you want your content to live, then consolidate if prompted or use File > Library > Organize Library > Consolidate Files. This assumes you have enough room to consolidate all of the content connected to the library. If not you may be able to consolidate a selection of files.
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