Soloists (in order of appearance)

Justin Bieber
Nicole Scherzinger
Jennifer Hudson
Jennifer Nettles
Josh Groban
Tony Bennett
Mary J. Blige
Michael Jackson
Janet Jackson
Barbra Streisand
Miley Cyrus
Enrique Iglesias
Jamie Foxx
Wyclef Jean
Adam Levine
P!nk
BeBe Winans
Michael Jackson
Usher
Celine Dion
Fergie
Nick Jonas (of Jonas Brothers)
Toni Braxton
Mary Mary
Isaac Slade
Lil Wayne
Carlos Santana (solo with a guitar)
Akon
T-Pain
LL Cool J
Will.i.am
Snoop Dogg
Busta Rhymes
Swizz Beatz
Iyaz
Kanye West





Chorus

Patti Austin / Zac Brown / Jimmy Jean-Louis / A. R. Rahman / Gladys Knight / Shakira / Rob Thomas
Musiq Soulchild / Randy Jackson / Taj Jackson / Taryll Jackson / TJ Jackson / Sean Garrett / Benji Madden
Joel / Madden / Al Jardine / India.Arie / Brian Wilson / Julianne Hough / Keri Hilson / Tyrese Gibson
Robin Thicke / Joe Jonas / Kevin Jonas / Trey Songz / Jason Mraz / Harry Connick Jr. / Vince Vaughn
Ethan Bortnick / Katharine McPhee / Faith Evans / Kid Cudi / Bizzy Bone / Jeff Bridges / Raphael Saadiq
Hilary Duff / Ann Wilson / Nancy Wilson / Orianthi (also on guitar) / Anthony Hamilton