Karl Johan Schuster, known as Shellback, is a Swedish record producer and songwriter who worked with and for American recording artist Britney Spears from 2008 to 2011.
Work with Britney Spears[]
Circus era[]
Songs[]
Miscellaneous[]
Songs[]
- "3"
Femme Fatale era[]
Songs[]
- "Criminal"
- "I Wanna Go"
- "Up n' Down"