Diane Warren

Self

Common

Self

Gloria Estefan

Self

Jerry Bruckheimer

Self

Jennifer Hudson

Self

Cher

Self

Randy Jackson

Self

Quincy Jones

Self (archival footage)

Clive Davis

Self

Kesha

Self

Beyoncé

Self (archival footage)

Lady Gaga

Self (archival footage)

David Foster

Self

LeAnn Rimes

Self

Len Chandler

Self

Kathrine Narducci

Self

Toni Braxton

Self

Sofia Carson

Self (archival footage)

Becky G

Self (archival footage)

Jon Batiste

Self (archival footage)

Gwen Stefani

Self (archival footage)

Blanco Brown

Self (archival footage)

Crystal Lujan

Self

Jack White

Self

Kathy Nelson

Self

Eric Vetro

Self

Bonnie Greenberg

Self

Paloma Faith

Self

Ringo Starr

Self