Do artists really sing during the Super Bowl halftime show or do they lip sync? - AS USA

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Do artists really sing during the Super Bowl halftime show or do they lip sync? (https://news.google.com/rss/articles/CBMiZ2h0dHBzOi8vZW4uYXMuY29tL25mbC9kby1hcnRpc3RzLX JlYWxseS1zaW5nLWR1cmluZy10aGUtc3VwZXItYm93bC1oYWxm dGltZS1zaG93LW9yLWRvLXRoZXktbGlwLXN5bmMtbi_SAXZodH RwczovL2VuLmFzLmNvbS9uZmwvZG8tYXJ0aXN0cy1yZWFsbHkt c2luZy1kdXJpbmctdGhlLXN1cGVyLWJvd2wtaGFsZnRpbWUtc2 hvdy1vci1kby10aGV5LWxpcC1zeW5jLW4vP291dHB1dFR5cGU9 YW1w?oc=5) AS USA

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Courtesy of http://www.LadyGagaMusic.co