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Karl Johan Schuster (born 1 February 1985), known professionally as Shellback, is a Swedish songwriter, record producer, and musician. Shellback was listed as the No. 1 producer of 2012 on Billboard magazine's year end chart, and he also topped the list of their "Top 10 Songwriters Airplay Chart" the same year; he has won two Grammy Awards. He regularly collaborates with songwriter Max Martin, and together they have produced, written, and/or co-written songs for P!nk ("So What", "Raise Your Glass", "Fuckin' Perfect", "Just Like Fire"), Taylor Swift ("We Are Never Ever Getting Back Together", "I Knew You Were Trouble", "22", "Shake It Off", "Blank Space", "Style", "Bad Blood", "Wildest Dreams"), Adam Lambert ("Whataya Want from Me", "If I Had You"), Britney Spears ("If U Seek Amy", "3", "I Wanna Go"), Usher ("DJ Got Us Fallin' in Love", "Scream"), Avril Lavigne ("What the Hell", "Wish You Were Here", "Smile"), Ariana Grande ("Problem"), Adele ("Send My Love (To Your New Lover)"), and Maroon 5 ("One More Night"). Shellback has collaborated with fellow producer Benny Blanco for "Payphone" and "Moves like Jagger" by Maroon 5 and "She Doesn't Mind" by Sean Paul. He has also produced songs by himself, including "Want U Back" by Cher Lloyd and "Animals" by Maroon 5.

Life and career

Karl Johan Schuster was born and raised in Karlshamn, Sweden. He started out as a drummer in local indie rock bands in Karlshamn, as well as recording all instruments on the 2003 Meriah demo ...Turn Him Your Other Cheek (a strictly black metal recording), before joining the hardcore/metal scene as a vocalist for Blinded Colony in 2004, with whom he recorded 2005's Promo Demo and 2006's Bedtime Prayers, drawing comparisons to fellow Swedish melodic death metal band In Flames, before leaving in 2007. In 2005 he also performed as a guest musician on the Faith album Sorg.

At the age of 16, Schuster met Max Martin through their mutual friend Julius. By that time, according to an interview in the Swedish music magazine Stim-magasinet, Schuster's taste in music was "too cool for school" and he had no interest in pop music whatsoever. Julius kept sending Schuster's indie rock/death metal demos to Martin, who became curious about what it would sound like if Schuster would make pop music. So in 2006 Martin invited Schuster to his studio in Stockholm to record a demo with him, and since 2007 Schuster has been signed to Martin's production company Maratone.[1]

Among the first songs Schuster co-wrote with Martin are Pink's 2008 single "So What" and Britney Spears' 2008 single "If U Seek Amy".[2] In 2012 Schuster won the STIM Platinum guitar prize. [3] In 2014, Schuster produced "Problem" alongside Max Martin and Ilya.[4] In 2015, Shellback collaborated with Swedish hardcore punk band Refused, as he is a both a fan of the band's music and friends with the band's drummer David Sandstrom. Sandstrom sent him the versions of the songs "Elektra" and "366" that Refused had recorded with producer Nick Launay, and Shellback replied with his own arrangements of the two songs. Refused frontman Dennis Lyxzen explained in June 2015 that Shellback's versions were "far more Refused than our versions" and "were better" than the Launay-produced versions. The two songs appear on Refused's comeback album Freedom—"Elektra" was released as a single on April 27, 2015—which was released on the label Epitaph Records on June 26, 2015.[5]


With Meriah
  • ...Turn Him Your Other Cheek (Demo) (2003)
With Blinded Colony
  • Promo Demo (2005)
  • Bedtime Prayers (2006)
As a guest musician
  • Faith - Sorg (2005)

Production discography

Title Year Album Songwriter Producer
"If U Seek Amy" 2008 Britney Spears – Circus YesY YesY
"I'm Gone I'm Going" Lesley Roy – Unbeautiful YesY YesY
"Boring" Pink – Funhouse YesY YesY
"It's All Your Fault" YesY YesY
"So What" YesY YesY
"Oxygen" 2009 Living Things – Habeas Corpus YesY YesY
"Bigger" Backstreet Boys – This Is Us YesY YesY
"3" Britney Spears – The Singles Collection YesY YesY
"Quitter" Carrie Underwood – Play On YesY YesY
"Friday I'll Be Over U" Allison Iraheta – Just Like You YesY YesY
"Just Like You" YesY YesY
"Outta My Head" Leona Lewis – Echo YesY YesY
"Naked" YesY YesY
"Whataya Want from Me" Adam Lambert – For Your Entertainment YesY YesY
"If I Had You" YesY YesY
"Kiss n Tell" 2010 Kesha – Animal YesY YesY
"Hungover" YesY YesY
"Party at a Rich Dude's House" YesY YesY
"Dinosaur" YesY YesY
"DJ Got Us Fallin' in Love" Usher – Versus YesY YesY
"Raise Your Glass" Pink – Greatest Hits... So Far!!! YesY YesY
"Fuckin' Perfect" YesY YesY
"Time Machine" Robyn – Body Talk YesY YesY
"Can't Find Entrance" 2011 Those Dancing Days – Daydreams & Nightmares YesY YesY
"Loser Like Me" Glee cast – Glee: The Music, Volume 5 YesY YesY
"Dancing Crazy" Miranda Cosgrove – High Maintenance YesY YesY
"I'll Survive You" BC Jean – Single YesY YesY
"Back 2 Life" E-Type – Single YesY YesY
"What the Hell" Avril Lavigne – Goodbye Lullaby YesY YesY
"Wish You Were Here" YesY YesY
"Smile" YesY YesY
"I Love You" YesY YesY
"I Wanna Go" Britney Spears – Femme Fatale YesY YesY
"Criminal" YesY YesY
"Up n' Down" YesY YesY
"Light Up the World" Glee cast – Glee: The Music, Volume 6 YesY YesY
"Moves like Jagger" Maroon 5 – Hands All Over YesY YesY
"Beggin' on Your Knees" Victorious cast – Victorious YesY YesY
"No More Secrets" Carolina Liar – Wild Blessed Freedom YesY YesY
"Me and You" YesY YesY
"Beautiful People" YesY YesY
"King of Broken Hearts" YesY YesY
"Salvation" YesY YesY
"All That Comes Out of My Mouth" YesY YesY
"Want U Back" Cher Lloyd – Sticks + Stones YesY YesY
"With Ur Love" YesY YesY
"Beautiful People" YesY YesY
"She Doesn't Mind" Sean Paul – Tomahawk Technique YesY YesY
"Payphone" 2012 Maroon 5 – Overexposed YesY YesY
"One More Night" YesY YesY
"Doin' Dirt" YesY YesY
"Scream" Usher – Looking for Myself YesY YesY
"We Are Never Ever Getting Back Together" Taylor Swift – Red YesY YesY
"I Knew You Were Trouble" YesY YesY
"22" YesY YesY
"Slut Like You" P!nk – The Truth About Love YesY YesY
"Your Body" Christina Aguilera – Lotus YesY YesY
"Let There Be Love" YesY YesY
"Kiss You" One Direction – Take Me Home YesY YesY
"Heart Attack" YesY YesY
"Nobody Compares" YesY YesY
"All That Matters (The Beautiful Life)" Kesha – Warrior YesY YesY
"Release You" 2013 Megan & Liz – Look What You Started YesY YesY
"Easier To Lie" Cassadee Pope – Frame by Frame YesY YesY
"On a Roll" Icona Pop – This Is... Icona Pop YesY YesY
"That High" Pitbull – Meltdown YesY
"Air Balloon" 2014 Lily Allen – Sheezus YesY YesY
"I Wish" Cher Lloyd – Sorry I'm Late YesY YesY
"Just Be Mine" YesY YesY
"Dirty Love" YesY YesY
"Blind Your Love" YesY YesY
"Killing It" YesY YesY
"I'm in Love" Ola Svensson – Carelessly Yours YesY YesY
"Tonight I'm Yours" YesY YesY
"Jackie Kennedy" YesY YesY
"Problem" (feat. Iggy Azalea) Ariana Grande - My Everything YesY YesY
"Animals" Maroon 5 – V YesY YesY
"In Your Pocket" YesY YesY
"Feelings" YesY YesY
"Shoot Love" YesY YesY
"Blank Space" Taylor Swift - 1989 YesY YesY
"Style" YesY YesY
"All You Had to Do Was Stay" YesY
"Shake It Off" YesY YesY
"Bad Blood" YesY YesY
"Wildest Dreams" YesY YesY
"How You Get the Girl" YesY YesY
"Wonderland" YesY YesY
"New Romantics" YesY YesY
"Talking Body" Tove Lo - Queen of the Clouds YesY YesY
"Bad Blood" (feat. Kendrick Lamar) 2015 Taylor Swift – 1989 YesY YesY
"Elektra" Refused - Freedom YesY YesY
"366" YesY YesY
"This Summer's Gonna Hurt Like A Motherfucker" Maroon 5 - V (re-release) YesY YesY
"The Original High" Adam Lambert - The Original High YesY YesY
"Rumors" (feat. Tove Lo) YesY YesY
"Evil In The Night" YesY YesY
"Run Away with Me" Carly Rae Jepsen - Emotion YesY YesY
"Send My Love (To Your New Lover)" Adele - 25 YesY YesY
"Rest Your Love" The Vamps - Wake Up YesY YesY
"Just Like Fire" 2016 Pink – Alice Through the Looking Glass YesY YesY
"Can't Stop the Feeling!" Justin Timberlake - Trolls YesY YesY
"Hair Up" YesY YesY
"Still Falling For You" Ellie Goulding - Bridget Jones's Baby YesY YesY

Billboard Hot 100

The following singles peaked inside the top ten on the Billboard Hot 100.

Number-one singles
  • "So What"
  • "3"
  • "Raise Your Glass"
  • "Moves like Jagger"
  • "We Are Never Ever Getting Back Together"
  • "One More Night"
  • "Shake It Off"
  • "Blank Space"
  • "Bad Blood"
  • "Can't Stop the Feeling!"
Top 10 Hits
  • "Whataya Want from Me"
  • "DJ Got Us Fallin' in Love"
  • "Fuckin' Perfect"
  • "Loser Like Me"
  • "I Wanna Go"
  • "Payphone"
  • "Scream"
  • "I Knew You Were Trouble"
  • "Problem"
  • "Animals"
  • "Style"
  • "Wildest Dreams"
  • "Just like Fire"
  • "Send My Love (To Your New Lover)"


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