Prince Ulrik John of Denmark was the song of Frederick II of Denmark, the King of Denmark and which other country?
Frederick II of Denmark Frederick II (1 July 1534 – 4 April 1588) was King of Denmark and Norway and duke of Schleswig from 1559 until his death.
Denmark in the Eurovision Song Contest 1978 Denmark was represented by the band Mabel, with the song "Boom Boom", at the 1978 Eurovision Song Contest, which took place on 22 April in Paris. "Boom Boom" was chosen as the Danish entry at the Dansk Melodi Grand Prix on 25 February, and marked Denmark's return to Eurovision after an 11-year absence. Other participants in the 1978 DMGP included both Denmark's Eurovision winners, Grethe Ingmann and the Olsen Brothers.