Her parents got her a guitar when she turned 16 and not long afterwards she wrote her first song.

She took vocal courses and then got hold of a producer and eventually got a record contract before she finished high school.

[citation needed] Melissa Horn's debut album Långa nätter was released on 30 April 2008 followed by Säg ingenting till mig on 14 October 2009.

Her fourth album Om du vill vara med mig was released on 2 October 2013 and her fifth album entitled Jag går nu came out on 27 November 2015.

Horn also sang "Kungsholmens hamn" in a memorial ceremony for the victims of the 2011 Norway attacks in Utøya and Oslo.