1 of 39 Michael Caulfield/WireImage.com
2 of 39 Rick Diamond/WireImage.com
Rihanna and Carrie Underwood
3 of 39 Michael Caulfield/WireImage.com
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5 of 39 Michael Caulfield/WireImage.com
6 of 39 Michael Caulfield/WireImage.com
7 of 39 Michael Caulfield/WireImage.com
8 of 39 Michael Caulfield/WireImage.com
9 of 39 Michael Caulfield/WireImage.com
10 of 39 Michael Caulfield/WireImage.com
Cyndi Lauper and Miley Cyrus
11 of 39 Michael Caulfield/WireImage.com
12 of 39 Kevin Mazur/WireImage.com
13 of 39 Michael Caulfield/WireImage.com
14 of 39 Michael Caulfield/WireImage.com
15 of 39 Michael Caulfield/WireImage.com
16 of 39 Michael Caulfield/WireImage.com
17 of 39 Michael Caulfield/WireImage.com
Aretha Franklin and Bebe Winans
18 of 39 Rick Diamond/WireImage.com
19 of 39 Michael Caulfield/WireImage.com
20 of 39 Kevin Mazur/WireImage.com
21 of 39 Michael Caulfield/WireImage.com
Ringo Starr and George Martin
22 of 39 Michael Caulfield/WireImage.com
23 of 39 Michael Caulfield/WireImage.com
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John Mayer and Alicia Keys
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27 of 39 Michael Caulfield/WireImage.com
Solange Knowles, Chris Brown and Akon
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29 of 39 Michael Caulfield/WireImage.com
30 of 39 Michael Caulfield/WireImage.com
31 of 39 Kevin Winter/Getty Images
32 of 39 Michael Caulfield/WireImage.com
Tony Bennett and Natalie Cole
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34 of 39 Michael Caulfield/WireImage.com
Josh Groban and Andrea Bocelli
35 of 39 Frank Micelotta/Getty Images
36 of 39 Michael Caulfield/WireImage.com
37 of 39 Michael Caulfield/WireImage.com
Lang Lang and Herbie Hancock
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39 of 39 Kevin Winter/Getty Images