Siegel organized a comeback event for the Disco band Dschinghis Khan in June 2018. Dschinghis Khan had been originally organized by Siegel and Dr. Bernd Meinunger to compete in the 1979 Eurovision Song Contest. After the success of their first hit, Dschinghis Khan, both men continued to write popular songs for this band, including Moskau and Hadschi Halef Omar. Siegel makes a rare appearance playing classical guitar in 1984 video footage of Dschinghis Khan performing Corrida and Ole Ole.