Justin Bieber
Nicole Scherzinger
Jennifer Hudson
Jennifer Nettles
Josh Groban
Tony Bennett
Mary J. Blige
Toni Braxton
Michael Jackson (archive footage)
Janet Jackson
Barbra Streisand
Miley Cyrus
Enrique Iglesias
Jamie Foxx
Wyclef Jean
Adam Levine
Pink
BeBe Winans
Usher
Céline Dion
Orianthi
Fergie
Nick Jonas
Mary Mary
T.I.
Isaac Slade
Carlos Santana
Lil Wayne
Akon
T-Pain
LL Cool J
Will.i.am
Snoop Dogg
Nipsey Hussle
Busta Rhymes
Swizz Beatz
Iyaz
Mann
Kanye West