# Shellback

Karl Johan Schuster, conhecido também como Shellback (Karlshamn, 1 de fevereiro de 1985), é um compositor, produtor musical e músico sueco. Já compôs canções para Britney Spears, Kesha, Usher, Adam Lambert, Maroon 5, Cher Lloyd, Taylor Swift, Avril Lavigne, Adele, Victoria Justice, entre outros.

## Discografia
### Com Meriah

* ...Turn Him Your Other Cheek (Demo) (2003)

### Blinded Colony

* Promo Demo (2005)
* Bedtime Prayers (2006)

### Como músico convidado

* Faith - Sorg (2005)
* Refused - War Music (2019)

## Discografia (produção)

| Ano | Título | Álbum | Co-escritor | Produtor ou co-produtor |
| 2008 | "If U Seek Amy" | Britney Spears – Circus | Sim | Sim |
| 2008 | "I'm Gone I'm Going" | Lesley Roy – Unbeautiful | Sim | Sim |
| 2008 | "Boring" | Pink – Funhouse | Sim | Sim |
| 2008 | "It's All Your Fault" | Pink – Funhouse | Sim | Sim |
| 2008 | "So What" | Pink – Funhouse | Sim | Sim |
| 2009 | "Oxygen" | Living Things – Habeas Corpus | Sim | Sim |
| 2009 | "Bigger" | Backstreet Boys – This Is Us | Sim | Sim |
| 2009 | "3" | Britney Spears – The Singles Collection | Sim | Sim |
| 2009 | "Quitter" | Carrie Underwood – Play On | Sim | Sim |
| 2009 | "Friday I'll Be Over U" | Allison Iraheta – Just Like You | Sim | Sim |
| 2009 | "Just Like You" | Allison Iraheta – Just Like You | Sim | Sim |
| 2009 | "Outta My Head" | Leona Lewis – Echo | Sim | Sim |
| 2009 | "Naked" | Leona Lewis – Echo | Sim | Sim |
| 2009 | "Whataya Want from Me" | Adam Lambert – For Your Entertainment | Sim | Sim |
| 2009 | "If I Had You" | Adam Lambert – For Your Entertainment | Sim | Sim |
| 2010 | "Kiss n Tell" | Kesha – Animal | Sim | Sim |
| 2010 | "Hungover" | Kesha – Animal | Sim | Sim |
| 2010 | "Party at a Rich Dude's House" | Kesha – Animal | Sim | Sim |
| 2010 | "Dinosaur" | Kesha – Animal | Sim | Sim |
| 2010 | "DJ Got Us Fallin' in Love" | Usher – Versus | Sim | Sim |
| 2010 | "Raise Your Glass" | Pink – Greatest Hits... So Far!!! | Sim | Sim |
| 2010 | "Fuckin' Perfect" | Pink – Greatest Hits... So Far!!! | Sim | Sim |
| 2010 | "Time Machine" | Robyn – Body Talk | Sim | Sim |
| 2011 | "Can't Find Entrance" | Those Dancing Days – Daydreams & Nightmares | Sim | Sim |
| 2011 | "Loser like Me" | Glee cast – Glee: The Music, Volume 5 | Sim | Sim |
| 2011 | "Dancing Crazy" | Miranda Cosgrove – High Maintenance | Sim | Sim |
| 2011 | "I'll Survive You" | BC Jean – Single | Sim | Sim |
| 2011 | "Back 2 Life" | E-Type – Single | Sim | Sim |
| 2011 | "What the Hell" | Avril Lavigne – Goodbye Lullaby | Sim | Sim |
| 2011 | "Wish You Were Here" | Avril Lavigne – Goodbye Lullaby | Sim | Sim |
| 2011 | "Smile" | Avril Lavigne – Goodbye Lullaby | Sim | Sim |
| 2011 | "I Love You" | Avril Lavigne – Goodbye Lullaby | Sim | Sim |
| 2011 | "I Wanna Go" | Britney Spears – Femme Fatale | Sim | Sim |
| 2011 | "Criminal" | Britney Spears – Femme Fatale | Sim | Sim |
| 2011 | "Up n' Down" | Britney Spears – Femme Fatale | Sim | Sim |
| 2011 | "Light Up the World" | Glee cast – Glee: The Music, Volume 6 | Sim | Sim |
| 2011 | "Moves like Jagger" | Maroon 5 – Hands All Over | Sim | Sim |
| 2011 | "Beggin' on Your Knees" | Victorious cast – Victorious | Sim | Sim |
| 2011 | "No More Secrets" | Carolina Liar – Wild Blessed Freedom | Sim | Sim |
| 2011 | "Me and You" | Carolina Liar – Wild Blessed Freedom | Sim | Sim |
| 2011 | "Beautiful People" | Carolina Liar – Wild Blessed Freedom | Sim | Sim |
| 2011 | "King of Broken Hearts" | Carolina Liar – Wild Blessed Freedom | Sim | Sim |
| 2011 | "Salvation" | Carolina Liar – Wild Blessed Freedom | Sim | Sim |
| 2011 | "All That Comes Out of My Mouth" | Carolina Liar – Wild Blessed Freedom | Sim | Sim |
| 2011 | "Want U Back" | Cher Lloyd – Sticks + Stones | Sim | Sim |
| 2011 | "With Ur Love" | Cher Lloyd – Sticks + Stones | Sim | Sim |
| 2011 | "Beautiful People" | Cher Lloyd – Sticks + Stones | Sim | Sim |
| 2011 | "She Doesn't Mind" | Sean Paul – Tomahawk Technique | Sim | Sim |
| 2012 | "Payphone" (feat. Wiz Khalifa) | Maroon 5 – Overexposed | Sim | Sim |
| 2012 | "One More Night" | Maroon 5 – Overexposed | Sim | Sim |
| 2012 | "Doin' Dirt" | Maroon 5 – Overexposed | Sim | Sim |
| 2012 | "Scream" | Usher – Looking for Myself | Sim | Sim |
| 2012 | "We Are Never Ever Getting Back Together" | Taylor Swift – Red | Sim | Sim |
| 2012 | "I Knew You Were Trouble" | Taylor Swift – Red | Sim | Sim |
| 2012 | "22" | Taylor Swift – Red | Sim | Sim |
| 2012 | "Slut Like You" | P!nk – The Truth About Love | Sim | Sim |
| 2012 | "Your Body" | Christina Aguilera – Lotus | Sim | Sim |
| 2012 | "Let There Be Love" | Christina Aguilera – Lotus | Sim | Sim |
| 2012 | "Kiss You" | One Direction – Take Me Home | Sim | Sim |
| 2012 | "Heart Attack" | One Direction – Take Me Home | Sim | Sim |
| 2012 | "Nobody Compares" | One Direction – Take Me Home | Sim | Sim |
| 2012 | "All That Matters (The Beautiful Life)" | Kesha – Warrior | Sim | Sim |
| 2013 | "Release You" | Megan & Liz – Look What You Started | Sim | Sim |
| 2013 | "Easier To Lie" | Cassadee Pope – Frame by Frame | Sim | Sim |
| 2013 | "On a Roll" | Icona Pop – This Is... Icona Pop | Sim | Sim |
| 2013 | "That High" (feat. Kelly Rowland) | Pitbull – Meltdown | Sim | |
| 2014 | "Air Balloon" | Lily Allen – Sheezus | Sim | Sim |
| 2014 | "I Wish" (feat. T.I.) | Cher Lloyd – Sorry I'm Late | Sim | Sim |
| 2014 | "Just Be Mine" | Cher Lloyd – Sorry I'm Late | Sim | Sim |
| 2014 | "Dirty Love" | Cher Lloyd – Sorry I'm Late | Sim | Sim |
| 2014 | "Blind Your Love" | Cher Lloyd – Sorry I'm Late | Sim | Sim |
| 2014 | "Killing It" | Cher Lloyd – Sorry I'm Late | Sim | Sim |
| 2014 | "I'm in Love" | Ola Svensson – Carelessly Yours | Sim | Sim |
| 2014 | "Tonight I'm Yours" | Ola Svensson – Carelessly Yours | Sim | Sim |
| 2014 | "Jackie Kennedy" | Ola Svensson – Carelessly Yours | Sim | Sim |
| 2014 | "Problem" (feat. Iggy Azalea) | Ariana Grande - My Everything | Sim | Sim |
| 2014 | "Animals" | Maroon 5 – V | Sim | Sim |
| 2014 | "In Your Pocket" | Maroon 5 – V | Sim | Sim |
| 2014 | "Feelings" | Maroon 5 – V | Sim | Sim |
| 2014 | "Shoot Love" | Maroon 5 – V | Sim | Sim |
| 2014 | "Blank Space" | Taylor Swift - 1989 | Sim | Sim |
| 2014 | "Style" | Taylor Swift - 1989 | Sim | Sim |
| 2014 | "All You Had to Do Was Stay" | Taylor Swift - 1989 | | Sim |
| 2014 | "Shake It Off" | Taylor Swift - 1989 | Sim | Sim |
| 2014 | "Bad Blood" | Taylor Swift - 1989 | Sim | Sim |
| 2014 | "Wildest Dreams" | Taylor Swift - 1989 | Sim | Sim |
| 2014 | "How You Get the Girl" | Taylor Swift - 1989 | Sim | Sim |
| 2014 | "Wonderland" | Taylor Swift - 1989 | Sim | Sim |
| 2014 | "New Romantics" | Taylor Swift - 1989 | Sim | Sim |
| 2014 | "Talking Body" | Tove Lo - Queen of the Clouds | Sim | Sim |
| 2015 | "Bad Blood" (feat. Kendrick Lamar) | Taylor Swift – 1989 | Sim | Sim |
| 2015 | "Elektra" | Refused - Freedom | Sim | Sim |
| 2015 | "366" | Refused - Freedom | Sim | Sim |
| 2015 | "This Summer's Gonna Hurt like a MotherFucker" | Maroon 5 - V (reissue) | Sim | Sim |
| 2015 | "The Original High" | Adam Lambert - The Original High | Sim | Sim |
| 2015 | "Rumors" (feat. Tove Lo) | Adam Lambert - The Original High | Sim | Sim |
| 2015 | "Evil in the Night" | Adam Lambert - The Original High | Sim | Sim |
| 2015 | "Run Away with Me" | Carly Rae Jepsen - Emotion | Sim | Sim |
| 2015 | "Send My Love (To Your New Lover)" | Adele - 25 | Sim | Sim |
| 2015 | "Rest Your Love" | The Vamps - Wake Up | Sim | Sim |
| 2016 | "Just Like Fire" | Pink – Alice Through the Looking Glass | Sim | Sim |
| 2016 | "Can't Stop the Feeling!" | Justin Timberlake - Trolls: Original Motion Picture Soundtrack | Sim | Sim |
| 2016 | "Hair Up" | Justin Timberlake - Trolls: Original Motion Picture Soundtrack | Sim | Sim |
| 2016 | "Still Falling For You" | Ellie Goulding - Bridget Jones's Baby | Sim | Sim |
| 2017 | "Bon Appétit" (feat. Migos) | Katy Perry – Witness | Sim | Sim |
| 2017 | "Roulette" | Katy Perry – Witness | Sim | Sim |
| 2017 | "Revenge" (feat. Eminem) | Pink - Beautiful Trauma | Sim | Sim |
| 2017 | "Whatever You Want" | Pink - Beautiful Trauma | Sim | Sim |
| 2017 | "Secrets" | Pink - Beautiful Trauma | Sim | Sim |
| 2017 | "...Ready for It?" | Taylor Swift - Reputation | Sim | Sim |
| 2017 | "Gorgeous" | Taylor Swift - Reputation | Sim | Sim |
| 2017 | "End Game" (feat. Ed Sheeran & Future) | Taylor Swift - Reputation | Sim | Sim |
| 2017 | "I Did Something Bad" | Taylor Swift - Reputation | Sim | Sim |
| 2017 | "Don't Blame Me" | Taylor Swift - Reputation | Sim | Sim |
| 2017 | "Delicate" | Taylor Swift - Reputation | Sim | Sim |
| 2017 | "So It Goes..." | Taylor Swift - Reputation | Sim | Sim |
| 2017 | "King of My Heart" | Taylor Swift - Reputation | Sim | Sim |
| 2017 | "Dancing with Our Hands Tied" | Taylor Swift - Reputation | Sim | Sim |
| 2018 | "Get Up and Fight" | Muse – Simulation Theory | Sim | Sim |
| 2019 | "I Don't Care" (with Justin Bieber) | Ed Sheeran – No.6 Collaborations Project | Sim | Sim |
| 2019 | ''Beautiful People'' (feat. Khalid) | Ed Sheeran – No.6 Collaborations Project | Sim | Sim |
| 2019 | ''Take Me Back to London'' (feat. Stormzy) | Ed Sheeran – No.6 Collaborations Project | Sim | |
| 2019 | ''Remember the Name'' (feat. Eminem and 50 Cent) | Ed Sheeran – No.6 Collaborations Project | Sim | Sim |
| 2019 | ''Only Human'' | Jonas Brothers – Happiness Begins | Sim | Sim |
| 2019 | "(Hey Why) Miss You Sometime" | P!nk – Hurts 2B Human | Sim | Sim |
| 2019 | ''Glad He's Gone'' | Tove Lo – Sunshine Kitty | Sim | Sim |
| 2020 | ''X'' | Jonas Brothers – XV | Sim | Sim |
| 2020 | "Diamonds" | Sam Smith – Love Goes | Sim | Sim |

### Billboard Hot 100

Os singles a seguir chegaram ao top ten na Billboard Hot 100.

#### Singles em primeiro lugar

* "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)"
* ''...Ready for It?''