Hunter Hayes Headlines the Live Finale of ABC’s "Greatest Hits"

Christopher Polk/Getty Images for StagecoachABC's summer music series Greatest Hits concluded on Thursday night with a live finale from the Microsoft Theatre in Los Angeles. Among the many music stars performing on the show were Hunter Hayes and Kelsea Ballerini.

Country and rock collided when Hunter teamed up with Smash Mouth for a performance of the band’s 1999 hit, “All Star.”

Sheryl Crow performed her debut hit “All I Wanna Do” with some help from Ballerini, who co-hosted the series with comedian Arsenio Hall.

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