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Apple has added Passbook functionality to its app for the iTunes Festival London 2013 app. Additionally, today’s update brings support for image viewing in an iOS device’s landscape orientation. The app was updated late last month to list the line-up of artists for the September Apple-run music festival. Apple announced this year’s festival last week, noting that artists such as Jack Johnson, Justin Timberlake, and Thirty Seconds to Mars would highlight the events. The app is currently not available in the United States iTunes Store.