 Complete the following phrase:  During the 1960s Duyn was a popular musician; he had performed in many Dutch bands such as Whiskers and the Jay-Jays. He was also active as a Club DJ at various Dutch nightclubs. In 1971 music producer Hans van Hemert invited Duyn to join his new music group Mouth  MacNeal, together with Maggie MacNeal. In 1972 they had their biggest hit How Do You Do, following several successful hits the duo represented the Netherlands at the 