Launch Music and hold down the Option Key at the same time.Once you've transferred a copy of your iTunes library onto an external hard drive, you will need to set a new path for the Music app by redirecting it to search the external hard drive for content rather than your local drive.
Step 3: Redirect iTunes to the new location This process could take a while, depending on your iTunes Music library's size on your Mac.
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Even if you think your library has all your information consolidated already, it can't hurt to do a manual check before moving any data. To ensure that you copy everything from iTunes over to an external hard drive, you should first consolidate your library. Over time, it's easy for your music, movies, apps, and other iTunes content to end up stored in various places throughout your computer's hard drive.