Their music is a mix of extreme metal ( black, death, thrash ) and traditionnal folkloric music, mainly from France but also from Ireland and celtic countries.
The lyrics are based on old legends from Britanny, epic stories and nature.

Heol Telwen released a demo in 2003 (Mor Braz) and his first album in 2005 (An Deiz Ruz).
They are now working on our second album.