On 28 November 2008 it was announced that Ernman would enter Melodifestivalen 2009 for the Eurovision Song Contest 2009, with the song "La voix" written by Fredrik Kempe. On 28 February 2009 Ernman competed in the 4th semi-final of Melodifestivalen in Malmö and became a finalist. She went on to win the final on 14 March at the Globe Arena in Stockholm, and to represent Sweden in the Eurovision Song Contest in Moscow. She qualified as a finalist on 12 May and performed in the finals on 16 May, where she finished 21st with 33 points. "La voix" was the first Swedish entry to contain a substantial amount of French lyrics; it was written by Ernman herself, who speaks French fluently.