In 2004, under the alias John Rock, he began in 2004 in a successful collaboration with house duo Musikk with a number of #1 singles on the Danish Dance Chart.
He released his solo Danish language single in May 2007, entitled "Lidt endnu" (meaning Just yet) In August 2007 landed a job as a radio host on commercial station Radio ABC in the program Mads og Jon[REF] .