Initially rooted in the traditional bagad format, which combines bagpipes, bombards, and drums, Bagad Brieg expanded its repertoire to include electric instruments and brass, creating a distinctive sound that resonates with diverse audiences. In 2007, the ensemble achieved a significant milestone by winning the Breton National Championship in the first category.

Embracing the pipe band tradition, Bagad Brieg began competing internationally in the early 2000s. Their dedication culminated in a victory at the 2014 World Pipe Band Championships in Grade 2, where they excelled in both piping and ensemble categories . The group has also consistently performed well in subsequent competitions, including a notable fourth-place finish in 2016.

Beyond competitions, Bagad Brieg is deeply involved in cultural events and festivals. They have performed at prestigious venues such as the Royal Concert Hall in Glasgow and participated in notable festivals like the Festival Interceltique de Lorient. Their innovative performances often blend traditional music with theatrical elements, captivating audiences and earning critical acclaim.

In recent years, Bagad Brieg has continued to thrive, securing top positions in national competitions and expanding its reach through international performances. The ensemble's commitment to musical excellence and cultural heritage ensures its enduring influence in the Breton music scene and beyond.