Petter Winnberg a.k.a. Petter Sebastian is a composer, producer and musician from Gothenburg, Sweden.
He began his musical career playing bass in the Icelandic reggae band Hjálmar, and lived in Iceland for many years before moving back to Sweden. Soon following his return, Winnberg started indie-pop band Little Majorette, and quickly became a sought-after producer and songwriter in the Swedish music scene. In 2013, Winnberg started the band Amason with Gustav Ejstes (Dungen), Amanda Bergman, Pontus Winnberg (Miike Snow), and fellow Little Majorette-member Nisse Törnqvist. Amason released their debut album Sky City to wide critical acclaim, selling out their first headlining tour and topping off the year with receiving Album of the Year at the Swedish Grammis Awards.