Born in
Lanrivain on 8 October 1930, Guilloux was the youngest of eight children. He taught himself how to play harmonica from a young age and learned the
Breton language through his mother's teachings of
catechism due to the fact that its teaching was banned in French schools. He grew up with vision problems, which prevented him from attending school until the age of 10. He then left school to work on his family's farm. With the revival of Breton culture following
World War II, he helped organize dance competitions. for which he won an award in 2008. In the 1960s, Guilloux appeared at multiple
festù noz and created his own original dance songs. During the cultural revival of the 1970s, he played the
kan ha diskan with friends such as Guillaume Jégou.
Paris,
Quebec, and Denmark. He taught the next generation of storytellers, such as ,
Annie Ebrel,
Denez Prigent, , ,
Yann-Fañch Kemener, and
Érik Marchand. Kemener was his partner during the
fest noz from 1979 to 1984. He became founding administrator of Radio Kreiz-Breizh in 1983. In 2019,
Dastum and the
Presses Universitaires de Rennes published a biography and CD on his work for the cultural heritage of Brittany titled
Marcel Le Guilloux. Chanteur, conteur, paysan du Centre-Bretagne. In May 2022, he left his hometown of Lanrivain to live in a nursing home in
Saint-Nicolas-de-Pélem. There, he died on 11 June 2024, at the age of 93. ==Decoration==