No purchase is necessary to enter to win. A purchase will not increase your chances of winning. Void where prohibited. Promotion period is January 1, 2015 - March 31, 2015. Visit www.shazam.net/rules_stackuptherewards for official rules and complete contest details. Amazon and Kindle Fire are not affiliated with and do not sponsor or endorse theservices of SHAZAM, Inc. or the "Stack up the Rewards" campaign.