Career
He has participated in Swedish versions of the musicals Les Misérables and Chess. In 2002, Kempe had a hit with Vincerò, where he mixed opera and disco. Kempe has participated in twice as a performer.
He entered 2004 with the song "Finally", a tribute to his favourite composer Benny Andersson and in 2005 together with Sanna Nielsen singing Du och jag mot världen.
In 2007, he co-wrote three songs. One was "Cara Mia", performed by Måns Zelmerlöw and another was "Vågar du, vågar jag", performed by Sanna Nielsen.
In 2008 he co-wrote the music and wrote the lyrics to the winning entry, "Hero", performed by Charlotte Perrelli. Once again in 2009, he wrote the music and lyrics for the winning song "Louisiana voix" performed by Malena Ernman.
Entries
In 2010 he composed and co-wrote the Norwegian entry, "My Heart Is Yours", for the Eurovision Song Contest 2010, performed by Didrik Solli-Tangen.