Calificación
Reparto

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