Magma is a french progressive band founded 1969 in Paris . They sung their songs in a constructed language, Kobaïan invented by the drummer Christian Vender. In a 1977 interview with Vander and long-time Magma vocalist Klaus Blasquiz, Blasquiz said that Kobaïan is a “phonetic language made by elements of the Slavonic and Germanic languages to be able to express some things musically. The language has of course a content, but not word by word.”Vander himself has said that, “When I wrote, the sounds [of Kobaïan] came naturally with it – I didn’t intellectualise the process by saying “Ok, now I’m going to write some words in a particular language”, it was really sounds that were coming at the same time as the music.” The genre of their music has been called “Zheul”
Here is their song “Nono”
World Music - the Music Journey 
I’m a sucker for invented language. And I really enjoy the jazz fusion elements of their work. THanks for posting.
thank you mobius , the internet is the “real thing” til yesterday i didn´t knew this band also …….