Ask the iTunes Guy: Syncing audiobooks, and why Apple Music tracks suddenly become unavailable

iTunes and Apple Music don't come with an owner's manual. Fortunately, Kirk McElhearn is an iTunes expert and happy to help.
The iTunes Guy
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Kirk McElhearn (@mcelhearn) writes about Macs, music and more on his blog Kirkville. He also runs Kirk's iTunes Forum, where users can discuss iTunes, iOS devices, music, and more.