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Morgan Wallen surprised fans at Eric Church's Philadelphia concert when he walked out on stage and asked, what's going on Philadelphia?
He walked out on stage while Eric Church was singing Wallen's song, Sand In My Boots.
The pair continued singing Wallen's songs, Whiskey Glasses, Somebody's Problem, Silverado for Sale and Quittin Time.
Wallen has referred to Eric Church as his musical hero.