Justin Bieber

Self (singing voice)

Nicole Scherzinger

Self (singing voice)

Jennifer Hudson

Self

Jennifer Nettles

Self (singing voice)

Josh Groban

Self

Tony Bennett

Self (singing voice)

Mary J. Blige

Self

Toni Braxton

Self (singing voice)

Michael Jackson

Self (archive footage)

Janet Jackson

Self (singing voice)

Barbra Streisand

Self (singing voice)

Miley Cyrus

Self

Enrique Iglesias

Self (singing voice)

Jamie Foxx

Self

Wyclef Jean

Self

Adam Levine

Self

Pink

Self (singing voice)

BeBe Winans

Self (singing voice)

Usher

Self

Céline Dion

Self (singing voice)

Orianthi

Self

Fergie

Self

Nick Jonas

Self

Mary Mary

Self

T.I.

Self

Isaac Slade

Self

Carlos Santana

Self

Lil Wayne

Self (singing voice)

Akon

Self (singing voice)

T-Pain

Self (singing voice)

LL Cool J

Self

will.i.am

Self (singing voice)

Snoop Dogg

Self (singing voice)

Nipsey Hussle

Self (singing voice)

Busta Rhymes

Self (singing voice)

Swizz Beatz

Self (singing voice)

Iyaz

Self (singing voice)

Mann

Self (singing voice)

Ye

Self