Katzenjammer was founded in 2007 by Anne Marit Bergheim, Marianne Sveen, Solveig Heilo and Turid Jørgensen while studying at a private music school in Oslo, Norway.

[1] Katzenjammer worked extensively with composer Mats Rybø in recording their debut studio album, Le Pop, which was released in September 2008.

In 2008, Le Pop was nominated for a Norwegian Spellemannprisen award for Best Debut Album of the Year.

[2] the album achieved chart success in other European territories, reaching number seven in Germany and 33 in Austria.

[8] The album's lead single, "I Will Dance (When I Walk Away)", was a minor hit in Germany, peaking at number 32.