Pwyll ap Siôn is a musicologist and composer. He read music at Magdalen College, Oxford, graduating in 1990. He studied composition at Bangor University with John Pickard, and also with Martin Butler, receiving his PhD in 1998. He has been a member of staff at the School of Music since 1993.

From: https://www.bangor.ac.uk/music-and-media/staff/pwyll-ap-sion/en#overview