Consolidating songs on itunes
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You’re recommended to consolidate your library In other words, consolidating an i Tunes library ensures that every referenced media file gets copied when you drag the i Tunes folder onto an external drive.
The easiest way to do so entails highlighting any item in i Tunes, like a song or an app, and bringing up the Info pane by hitting Command (⌘) – I.
Now click the File tab and make sure the file path in the Location section points to the i Tunes folder on the external drive, not to the old i Tunes folder on your Mac.
Step 18: You can now free up storage by trashing the original i Tunes folder on your Mac.
Moreover, you can safely delete files added to i Tunes when the option “Copy files to i Tunes Media folder when adding to library” was disabled because the library is now consolidated and everything should live inside the i Tunes folder.