Multi-talanted Petter Winnberg is a composer, producer and musician from Gothenburg, Sweden. He began his musical career playing bass in the Icelandic reggae band Hjálmar. Winnberg then 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 a world wide critical acclaim, selling out their first headlining tour and topping off the year with receiving Album of the Year Award at the Swedish Grammy Awards. 

As a producer, songwriter, and musician, Winnberg has collaborated with artists such as Miike Snow, Veronica Maggio, and Amanda Bergman. As a film and commercials composer, Winnberg has worked with clients such as Mercedes-Benz, Volvo, H&M, IKEA and Vogue through the collaboration and guidance from Universal Music Publishing. 

In 2017 Petter Winnberg released the album 'The Dog and the Shepherd' and EP 'BAABAA005' (music from the Mercedes-Benz campaign) under his artist alias Petter Sebastian.