 Abjean has written numerous sacred and secular choral works, often setting the Breton language, such as the "Missa Keltia" in 1975, the cantatas "Ar Marc’h Dall" in 1979, "War Varc’h d’ar Mor" in 1987 and "Kan evit ar Peoc’h" in 1989.He has also arranged sea shanties.He regularly works with the Chœur d'Hommes Mouezh Paotred Breizh, created in 1993 by his friend Jean-Marie Airault.