L'Affaire Louis' Trio were an art pop band from Lyon, France. The band formed in 1982, and in 1986 were signed to Barclay records, France, who released their first album, Chic planète. The members were: singer / guitarist Cleet Boris, guitarist Karl Niagara and keyboardist / drummer Bronco Junior. In 1987, L'Affaire Louis' Trio were awarded the prize for best newcomers at France's Victoires de la Musique ceremony.
The trio stayed together until 1997, when Vincent Mounier left during the recording of their 1997 release, Europium. Since then, the band was dissolved, but Hubert Mounier recorded with drummer Lebleu on his first two solo releases, Le Grand Huit and Voyager léger. He had also worked extensively as a comic book artist under his Cleet Boris pseudonym. He died of an aortic dissection on 2 May 2016 at the age of 53.