In 1986, Bohlen wrote the title song "Midnight Lady" of "Tatort" episode ', which was performed by former Smokie singer Chris Norman and was major hit in Central Europe, topping several charts. The song appeared on Norman's second solo album "Some Hearts Are Diamonds", which was produced by Bohlen. In 1988, he wrote the title song of "Tatort" episode ', "Silent Water", which he performed himself as Blue System. In 1989, two songs written and produced by him were sent to the Eurovision Song Contest: Nino de Angelo represented Germany with the song "Flieger" and reached place 14, while Thomas Forstner represented Austria with the song "Nur ein Lied" and reached place 5. Also in 1989, Bohlen wrote the soundtrack to the ZDF series "Rivalen der Rennbahn", which was certified platinum in Germany that same year and reached the top 5 in Germany, Austria, and Switzerland.