Following his success in the 1960s, Parker's career lulled. In the early 1970s, he was Editor-in-Chief of Bayerischer Rundfunk and a disk jockey at "Club 16 um 17". He took part in the German selection show for the Eurovision Song Contest 1972, in which he came in eleventh of twelve entries. In the 1980s, he enjoyed success in the Volkstümliche Musik genre.