I found something from the singer I loved that show, disco was a famous German TV music show. Gosh, I was 5 years old.
For Germans this video might be funnier, since there are other musicians and singer there - from the look it should be ZDF Hitparade.
Then it is less like the French show, because I can’t recall it being a competition. The show format is almost equal with the German “offshoot” - Sing meinen Song.
It’s almost impossible to find a decent clip since the TV broadcaster is a private one, and they are eager to make money of it. Understandable but well unfortunate for us. Mary Roos is a famous German singer for decades. She was probably the oldest one up to date the show had more singers from 20 to 50 years old.
Ah, forgot in the German version, one episode is for one singer and the others will sing versions of some known or less known songs and put them in a different version.