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She started music at an early age. In 1985, she formed a reggae band with drummer Emil Jørgensen, named Rocka. She also sang in a choir between 1991 and 1994. In 1995, she recorded an album in London with producer Tim Simenon, but the album was never released.
In 1996 she formed a band with her boyfriend Tim Christensen, her Rocka band partner Emil Jørgensen, and guitarist Jonas Struck. Christensen left the band in 1999.
In Swan Lee
After the departure of Christensen, the remaining trio (Rosendahl, Jørgensen and Struck) continued playing together and renamed their band as Swan Lee. An entire album was recorded with the newly-signed Cannibal Records, but the label never released because of musical differences with the label's director Kim Hyttel, followed by lawsuits. Other record companies rejected them seeing a potential only in Rosendahl.
The band finally decided to establish their own record label, named GoGo Records, and in February 2001 released their debut album Enter. The album sold 20,000 copies and contained, the single "Tomorrow Never Dies", written in collaboration with Tim Christenen. In 2004, the band had another album, the self-titled Swan Lee in 2004. Swan Lee disbanded in September 2005.
In The Storm
In late summer 2007, she and her husband Johan Wohlert formed a rock band The Storm after he quit his former band Mew. The Storm has released two albums Where the Storm Meets the Ground in 2008, and Black Luck in 2009.
- Rosendahl has appeared on albums with Puddu Varano in 2001, Claus Hempler in 2004
- In 2002 she appeared in Cheshire on the song "You & I" which was later remixed by Trentemoller.
- In 2006, she sang on the soundtrack for the film Supervoksen in a cover version of D-A-D's hit "Laugh 'n' a Half". The film was directed by her sister Christina Rosendahl.
- In 2006, her band Swan Lee's song Tomorrow Never Dies was featured in Danish IO Interactive's videogame Hitman: Blood Money.
- In 2008 she starred in the song "Mary Ann's Place" by the Danish metal band Volbeat on their album Guitar Gangsters & Cadillac Blood.
- She became a judge in the Danish X Factor in season 3 in 2010 and season 4 in 2011. In season 3, she mentored the eventual winner Thomas Ring Petersen during the final on 27 March 2010 also writing the winner's song "My Dream"
- She was also singing the Danish National song in the boxing match between Mikkel Kessler and Mehdi Bouadla.
- 1997: Dream Away
- As part of Swan Lee
- 2001: Enter
- 2004: Swan Lee
- As part of The Storm
- 2008: Where the Storm Meets the Ground
- 2009: Black Luck
- 2011: Rebel Against Yourself
- NordJyske: X-factor-dommer går egne veje (in Danish)