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WikiPedia: Witness: The Tour https://www.azcentral.com/story/entertainment/musi... https://www.forbes.com/profile/katy-perry/#691f334... https://www.forbes.com/sites/zackomalleygreenburg/... https://www.katyperry.com/tour/ https://www.katyperry.com/witnessthefuture-boys-gi... https://www.pollstar.com/Chart/2018/01/2017YearEnd... https://www.pollstar.com/Chart/2018/07/2018MidYear... https://www.pollstar.com/Chart/2018/12/2018YearEnd... https://www.stubhub.co.uk/magazine/taylor-swift-be...