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 Duets

Harry Styles, Meghan Trainor
Justin Bieber, Cody Simpson, Home to Mama
Opening Act Performance: Jason Mraz and Jono
Neil Patrick Harris, Jason Segel
Kelly Clarkson Compares "Duets" To "Idol"
Lady Gaga, Christina Aguilera, The Voice
Ron Burgundy, Anchorman, Robin Thicke
John Mayer, Katy Perry, Who You Love