Gwerz (Breton: [ɡʷɛ̞ʀz], "ballad", "lament", plural gwerzioù) is a type of folk song of Brittany.
In Breton music, the gwerz tells a story[1] which can be epic, historical, or mythological.
The gwerz is characterised by an often monotonous melody and many couplets, all in the Breton language.
Though historically sung unaccompanied,[2] some modern musicians use limited instrumentation with the gwerz.
Some of the most famous performers in current gwerzioù are Erik Marchand, Yann-Fañch Kemener, and Denez Prigent.