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Winx Club: The Mistery of the Abyss is the soundtrack of the third Winx Club movie: Winx Club: The Mystery of the Abyss. It was released on the Italian Amazon on September 4th, 2014. and on the United States iTunes Store on October 25th, 2014.
On Amazon, all the titles are written with capitals for each words' first letter, while on iTunes only transformations' names, the word Winx and each titles' first word are written with a capital letter at the start.
The iTunes title is Winx Club - Il Mistero Degli Abissi - Single for the Italian album and Winx Club: The Mistery of the Abyss - Single for the English one.
The English title should have been written "Winx Club: The Mystery of the Abyss", with a "y" instead of the "i" in the word "mistery".