For the first of two big collaborations on the ACM Awards that connected pop and country, Christina Aguilera and Rascal Flatts traded off on

It began with Aguilera’s “Shotgun.” Unfamiliar? It’s a new one; it comes from Aguilera’s Nashville guest-starring role from earlier this month. Aguilera took the lead on the song, joined by Rascal Flatts in harmony before a white backdrop.

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Related: The 2015 ACM Awards Live Blog

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Afterward, Rascal Flatts took on new single “Riot,” a slow burner on which Aguilera assumed lead vocals on the second verse before she and lead vocalist Gary LeVox harmonized on the chorus.

For the finale, they were joined by a black-clad gospel choir.

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