Jean-Louis Jossic is a member of the Breton folk group Tri Yann. He plays bombarde in addition to providing vocals. He was one of the three founding members of the group in 1970.
Initially a teacher of history, geography and art at the CEG in Savenay, his interest in Breton music and culture came from Alan Stivell.
He has participated actively in the political and cultural life of Nantes.