Ben Harper

Grammy Award-Winning Singer-Songwriter, Multi-Instrumentalist & Activist

Regina Spektor

American Singer-Songwriter and Pianist

Mike Posner

Singer-Songwriter and Music Producer; Best Known for "Cooler Than Me" & "I Took a Pill in Ibiza"

Ani Difranco

Folk/Punk Icon & Founder of Righteous Babe

Zoe Kravitz

Actress and singer

Drake

Canadian Actor, Rapper & Singer Known for "One Dance" and "Hotline Bling"

Pink

Singer-Songwriter, Actress, Philanthropist & Environmental Activist

Bob Dylan

Legendary Singer-Songwriter and Entertainer; Known for "The Times They Are a-Changin'"

Lisa Loeb

Grammy-Nominated Singer & Songwriter

Randy Newman

Singer-Songwriter, Arranger & Composer Known for Scoring "Toy Story," "Marriage Story" and "The Princess and the Frog"

Adam Lambert

Singer-Songwriter and Stage Actor; Contestant on "American Idol"

Kinky Friedman

Political Satirist & Musician

Gene Simmons

Media Mogul & Co-Founder of the Legendary Rock Group KISS

Ashley Tisdale

Actress, Singer & Producer

Barry Manilow

Singer-Songwriter Known for "Mandy" and "Can't Smile Without You"

Michael Bolton

Singer-Songwriter Known for his Soft Rock Ballads

Michael Bolton reveals brain tumor diagnosis, ‘immediate surgery’ in emotional note to ...

Celeste

Award-Winning Singer-Songwriter Known for "Not Your Muse"

Sam Tsui

Musician, Digital Correspondent & YouTube Influencer

Aloe Blacc

Singer-Songwriter, Rapper & Musician; Known for "I Need A Dollar" & "Wake Me Up"

Miri Ben-Ari

Grammy Award-Winning Violinist, Producer, Humanitarian & UN Goodwill Ambassador of Music

Rozzi Crane

Singer-Songwriter; Signed to Adam Levine's Label 222 Records

Neon Trees

Alternative Rock Band Known for their Single "Everybody Talks"

David Geffen

Business Magnate, Producer, Film Studio Executive & Philanthropist

Scarlett Johansson

Award-Winning Actress & Singer Known for Portraying the Black Widow in the Marvel Cinematic Universe

Nikki Reed

Actress, Singer-Songwriter & Model; Founder & CEO of Eco-Sustainable Fashion Brand Bayou With Love; Autism & Environmental Advocate

Idina Menzel

Actress & Singer, Best Known as the Voice of Elsa in Disney's "Frozen" and For Originating the Role of Elphaba in "Wicked"

Bryan Greenberg

Actor Known for his Roles in "One Tree Hill," "Bride Wars" and "How to Make It In America," Among Others

James Franco

Actor and Filmmaker; Known for "Oz the Great and Powerful" and "Spider-Man"

Evan Rachel Wood

Emmy Award-Nominated Actress; Known for "True Blood," "Thirteen" and "West World"

Adam Levine

Singer-Songwriter, Front Man of the Pop-Rock Band Maroon 5 & Former Coach on "The Voice"