Mac OS has the built-in migration tools, which could be extremely helpful if you need to upgrade the old Macs to the new Macbook. But as a matter of fact, in many cases you won't have a decent backup on your old Macs due to some unexpected disaster strikes.
If, unfortunately, your situation is precisely the same, then there are lots of things you want to get back, e.g., your photos, mails, apps, etc. Thanks to the iCloud service, you can get most of them right onto your new Mac. However, if you found the iCloud didn't recover your iTunes music library, then please read on this article, which will help you transfer the music from your iPod to any Macbooks without the hassle.
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