Shellback (record producer)
Karl Johan Schuster, known professionally as Shellback, is a Swedish record producer, songwriter and multi-instrumentalist. 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 four Grammy Awards.
Shellback in 2015
Karl Martin Sandberg, known professionally as Max Martin, is a Swedish record producer and songwriter. He rose to prominence in the late 1990s with songwriting credits on a string of hit singles, such as Britney Spears's "...Baby One More Time" (1998), the Backstreet Boys' "I Want It That Way" (1999), CĂ©line Dion's "That's the Way It Is" (1999) and NSYNC's "It's Gonna Be Me" (2000).
Martin in 2023