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Calvin Harris, Demi Lovato And Others Sign Open Letter About Gun Control

Calvin Harris and Demi Lovato know their voices carry more weight than the average person, and they are using that power to fight for a cause they believe in.

Over 150 musicians and industry executives from Paul McCartney to Zayn Malik signed a letter published in Billboard magazine's newest issue, urging Congress to "stop gun violence now."

The signatures are featured on the magazine's cover, demanding change.

The letter, drafted by Billboard editors, highlights two major demands of Congress: Require background checks for gun sales and ban those on the terror watch list from purchasing guns.

These demands are in response to the mass shooting at Orlando's Pulse nightclub on June 12, which killed 49 innocent people.

In a note from Billboard before the letter, the editors explain their horror at the terrible shooting and the process of reaching out to nearly 200 artists to support them in a campaign for stricter gun control.

The editors wrote,

Within minutes, Joan Jett was the first to sign on. Lady Gaga shortly followed. Within hours, and then in a matter of just a few days, nearly 200 top artists and executives—pop stars (including Grimmie's friend Selena Gomez), rappers, rock gods, legends, Broadway heroes, even two Beatles and Yoko Ono -- lent their voices to the chorus of Americans looking to our political leaders for change.

This letter comes only days after Republicans in the Senate blocked several important gun control measures from passing.

See a complete list of artists who signed below:

Adam Lambert

Adam Levin (X Ambassadors)

Akiva Schaeffer

Alan Gilbert (NY Philharmonic)

Alanis Morissette

Alex Pall (The Chainsmokers)

Alicia Keys

Andrew Bird

Andy Samberg

Angel Coleman

Barbra Streisand

Beck

Bill Kreutzmann (Dead & Company)

Billy Joel

Bo Koster (My Morning Jacket)

Bob Weir (Dead & Company)

Bonnie Raitt

Brad Delson (Linkin Park)

Brendon Urie (Panic at the Disco)

Britney Spears

Butch Walker

Calvin Harris

Cam

Carl Broemel (My Morning Jacket)

Carole King

Casey Harris (X Ambassadors)

Charlie Puth

Cher

Chester Bennington (Linkin Park)

Christina Aguilera

Christina Perri

Conan O'Brien

Courtney Love

Cyndi Lauper

Demi Lovato

Diplo

Drew Taggart (The Chainsmokers)

Eddie Vedder (Pearl Jam)

Elle King

Ellen DeGeneres

Elvis Costello

Emily Robison (Dixie Chicks)

Eric Hutchinson

Fher Olvera (Maná)

Glenn Kotche (Wilco)

Gregory Porter

Halsey

Iggy Pop

Jack Antonoff

Jackson Browne

James Corden

Jason Mraz

Jean Michel Jarre

Jeff Ament (Pearl Jam)

Jeff Chimenti (Dead & Company)

Jeff Tweedy (Wilco)

Jennifer Lopez

Jim James (My Morning Jacket)

Joan Jett

Joe Hahn (Linkin Park)

Joe Jonas

John Mellencamp

John Stirratt (Wilco)

Jorge Hernandez (Los Tigres del Norte)

Josh Groban

Julia Michaels

Justin Tranter

Kaskade

Katy Perry

K.D. Lang

Kelly Rowland

Kesha

Kid Cudi

Lady Gaga

Lecrae

Lin-Manuel Miranda

Macklemore

Mark Ronson

Martie Maguire (Dixie Chicks)

Matisyahu

Matt Cameron (Pearl Jam)

Meghan Trainor

Melissa Etheridge

Michael Bublé

Michael Stipe

Mickey Hart (Dead & Company)

Mikael Jorgensen (Wilco)

Mike D

Mike McCready (Pearl Jam)

Mike Shinoda (Linkin Park)

My Morning Jacket

Natalie Maines (Dixie Chicks)

Nate Reuss

Nick Jonas

Nicky Jam

Pat Monahan

Pat Sansone (Wilco)

Patrick Hallahan (My Morning Jacket)

Paul McCartney

Pete Wentz

Peter Tork

Prince Royce

Pusha T

Questlove

Ricky Martin

Ringo Starr

Rivers Cuomo

Rob Bourdon (Linkin Park)

Rob Thomas

Rosanne Cash

Rufus Wainwright

Ryan Leslie

Ryan Lewis

Sam Harris (X Ambassadors)

Sara Bareilles

Selena Gomez

Shakira

Sia

Stevie Nicks

Sting

Stone Gossard (Pearl Jam)

Talib Kweli

Terence Blanchard

Thom Yorke

Tom Blankenship (My Morning Jacket)

Tony Bennett

Tori Amos

Trent Reznor

Troye Sivan

Vic Mensa

Wayne Coyne

Yoko Ono

Zayn Malik

Citations: Lady Gaga, Selena Gomez, Demi Lovato and More Musicians Implore Congress to "Stop Gun Violence Now" in Open Letter (E! News), AN OPEN LETTER TO CONGRESS: STOP GUN VIOLENCE NOW (Billboard)