David Foster

Self

Kristin Chenoweth

Self

Bill Clinton

Self

Barbra Streisand

Self

Quincy Jones

Self

Lionel Richie

Self

Diane Warren

Self

Tommy Mottola

Self

Paul Anka

Self

Céline Dion

Self

Peter Cetera

Self

Erin Foster

Self

Sara Foster

Self

Clive Davis

Self

Ben Vereen

Self (archive footage)

Michael Bublé

Self

Andrea Bocelli

Self

Josh Groban

Self

Katharine McPhee

Self