Question: The band represents who with the  band's breakthrough single in the album that includes the follow up of a German-language single at he Eurovision Song Contest 1979?
Sentence (from "Dschinghis Khan (album)"): The album includes the band's breakthrough single, also called "Dschinghis Khan", with which they represented Germany at the Eurovision Song Contest 1979, finishing in 4th position.
Relevant evidence: Yes