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Who co-wrote Beyoncé's song "Halo" (2008)?
Bruno Mars
Skylar Grey
Ryan Tedder
Kesha
Jack Antonoff
Ingrid Michaelson
Charli XCX
Frank Ocean
Ester Dean
Ed Sheeran
Tove Lo
Dan Wilson (of Semisonic)
Sia
Jessie J.
Christina Aguilera
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