1 of 19 Dimitrios Kambouris/Getty Images
2 of 19 Dimitrios Kambouris/Getty Images
3 of 19 Dimtrios Kambouris/Getty Images
4 of 19 Dimitrios Kambouris/Getty Images
Ryan Lewis and Macklemore
5 of 19 FilmMagic for YouTube
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7 of 19 FilmMagic for YouTube
Peter Berkman, James DeVito and Ary Warnaar of Anamanaguch
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Lloyd 'EpicLLOYD' Ahlquist and Peter 'Nice Peter' Shukoff of Epic Rap Battles of History
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Camila Cabello, Dinah Jane Hansen, Lauren Jauregui, Normani Hamilton and Allyson Brooke Hernandez of Fifth Harmony
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Tiffany of Girls' Generation
12 of 19 Dimitrios Kambouris/Getty Images
13 of 19 Dimitrios Kambouris/Getty Images
14 of 19 Dimitrios Kambouris/Getty Images
Christina Topsoe and James Murphy of LCD Soundsystem
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16 of 19 FilmMagic for YouTube
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18 of 19 FilmMagic for YouTube
Megan Mace and Elizabeth Mace of Megan & Liz
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Dan Konopka, Andy Ross, Tim Nordwind and Damian Kulash of OK GO