The promotion last from December 26 to January 6, offering a free music track, TV episode, film or app every day. Each download is available for 24 hours.
A dedicated website, http://www.itunes12daysofchristmas.co.uk/, goes live today, where people can sign up for daily email alerts.
A similar promotion last year included free music from artists including Katy Perry, Lily Allen and The Ting Tings.
12 Days of Christmas is running across Europe.
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