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I have this setup, movies on external drive music on MacBook pro. It's a bit tedious to manage if you are adding content not from Apple. For my movies I manually copy them to external drive and then add them to iTunes, making sure to uncheck the box for keeping library organized. Music is less work if it comes from iTunes or even Amazon since these will download to the computer and get added straight to iTunes. So unless you're pulling music from a disc or something you should be ok, just watch where it goes and move it if necessary.