In 2002, Sidsel makes her first movements into the world of jazz attending the Den Rytmiske Højskole in Vig.
In 2003 she began studying voice at Musikalsk Grundkursus in Copenhagen.
She attended the jazz meet Brandbjerg Jazzstævne 2003-2004, where she sang, met great musicians, made new friends and immersed herself in jazz. The following year, Sidsel started her jazz band Sidsel Storm Quartet, performing at jazz festivals in Denmark. She also joined the pop-electro band Next to Beluga.