独唱(出场序):
Justin Bieber
Nicole Scherzinger
Jennifer Hudson
Jennifer Nettles
Josh Groban
Tony Bennett
Mary J. Blige
Michael Jackson (录音)
Janet Jackson
Barbra Streisand
Miley Cyrus
Enrique Iglesias
Jamie Foxx
Wyclef Jean
Adam Levine
Pink
BeBe Winans
Usher
Celine Dion
Orianthi (结他演奏)
Fergie
Nick Jonas
Toni Braxton
Mary Mary
Isaac Slade
Lil Wayne
Carlos Santana (结他演奏)
Akon
T-Pain
LL Cool J (说唱)
Will.i.am (说唱)
Snoop Dogg (说唱)
Busta Rhymes (说唱)
Swizz Beatz (说唱)
Iyaz (说唱)
Nipsey Hussle (说唱)
Kanye West
合唱:
Patti Austin
Philip Bailey
Fonzworth Bentley
Bizzy Bone
Ethan Bortnick
Jeff Bridges
Zac Brown
Brandy
Kristian Bush
Natalie Cole
Harry Connick Jr.
Nikka Costa
Kid Cudi
Faith Evans
Melanie Fiona
Sean Garrett
Tyrese Gibson
Anthony Hamilton
Rick Hendrix
Keri Hilson
Julianne Hough
Nipsey Hussle
India.Arie
Randy Jackson
Taj Jackson
Taryll Jackson
TJ Jackson
Al Jardine
Jimmy Jean-Louis
Ralph Johnson
Joe Jonas
Kevin Jonas
Nick Jonas
Rashida Jones
Gladys Knight
Benji Madden
Harlow Madden
Joel Madden
Katharine McPhee
Jason Mraz
Mýa
Freda Payne
A. R. Rahman
RedOne
Nicole Richie
Raphael Saadiq
Trey Songz
Musiq Soulchild
Jordin Sparks
Robin Thicke
Rob Thomas
Vince Vaughn
Verdine White
Ann Wilson
Brian Wilson
Nancy Wilson
指挥:
Quincy Jones
Lionel Richie
参考资料：http://wearetheworldfoundation.org/the-song/credits/