On a picture perfect late September evening in Ann Arbor, a massive crowd filed into Michigan Stadium Saturday for Zach Bryan's sold-out concert, making the first show at the storied venue a potential record breaker for the highest attended ticketed concert in U.S. history.

Final attendance figures were not immediately available Saturday.

Bryan, the 29-year-old Oklahoman and country music rabble-rouser, gave a spirited, soulful, two-and-a-half hour headlining set, which featured guest appearances by opener John Mayer and Albion, Michigan country/ Americana duo the War and Treaty.

"Thank you so much for the best night of my life!" Bryan said a few songs into his set, during a rollicking, emotion-packed "East Side of Sorrow."

Bryan was dressed in a crowd-pleasing maize and blue Universit

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