Shellback (producer)

Shellback (producer)

Karl Johan Schuster, known professionally as Shellback, is a Swedish songwriter, record producer and musician. Shellback was listed as the #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 regularly collaborates with songwriter Max Martin, and together they've written "So What", "Raise Your Glass" and "Fuckin' Perfect" by Pink, "We Are Never Ever Getting Back Together", "I Knew You Were Trouble", and "22" by Taylor Swift, "Whataya Want from Me" by Adam Lambert, "3" and "I Wanna Go" by Britney Spears, and "DJ Got Us Fallin' in Love" and "Scream" by Usher, all of which have charted within the top 10 on the Billboard Hot 100 in the United States. Shellback also co-wrote and produced "One More Night", "Payphone" and "Moves Like Jagger" by Maroon 5, the latter spent eight weeks at #1 on the World Chart.