Tri Yann (breton for the "three Johns") is a Breton folk-rock band founded in 1971 by Jean-Louis Jossic, Jean Chocun and Jean-Paul Corbineau. The band began by playing traditional Breton music on traditional instruments like mandoloncello, dulcimer, psaltery, bombarde, cromorne and shawm. In 1976, with "La Découverte ou l'Ignorance", they started to introduce some rock elements like electric bass and drums. Today they are one of the longest-standing Breton music groups surviving from the folk-rock revival of the 1970s.