This Knowledge of Music

The advertising...
Evolution of a song:
1) The old, still DDR group: Karlmarksstadt, Karlmarksstadt...
2) Someone of our singers: Landis, landis...
3) I, apophesus from KFC (IMHO): Naggets, Naggets...
P. S. Nugget (English) and self-made.

You confused everything.
"Landyshi" is a song from the 50s, written by Oscar Felzman.
"Karlmarkstadt" is a song for the same melody "Landyshey", written by the band "Megapolis".
Russian group in German! Here are the words of Feltzman on this subject:
"musicist and producer Oleg Nesterov translated to German "Landyshi" and got the song "Karlmarksstadt"
I was unable to find the year in which Karlmarkstadt was written, but clearly later than 1980.
And the advertisement of naggets is clearly written on the motifs of the "Landyshi", and not at all "Karlmarkstadt".