Sion Dey is Ireland/London based multi-instrumentalist, producer and composer. His work carries influences of Baroque, Minimalism and experimental music. He wrote the music for I Am Dying, a documentary special for The National Geographic Channel helmed by Academy Award® winning directors TJ Martin and Dan Lindsay. The documentary chronicled people’s final days before death, celebrating their lives and legacy through verité footage, home movies, photos and interviews with friends and family. Producers included Joaquin Phoenix, Casey Affleck and Mary Lisio of Ridley’s Scott’s production company, Scott Free. He has performed in multiple contemporary festivals and venues in between music for film.

He composed the music for the Darren Aronofsky helmed campaign for the New York Times; short films chronicling the lives of four photojournalists in the search to uncover the truth within various aspects of conflict and displacement. 

He recently completed the score for the debut film of Mobolaji Olambiwonnu, Ferguson Rises. A documentary that presents and examines various perspectives of the town in the aftermath of the killing of Mike Brown by police officer Darren Wilson. Produced in partnership with Yoruba/Saxon, this project is executive produced by T.J. Martin, David Oyelowo and Gigi Pritzker. It won the Audience Choice Award at Tribeca 2021. 

He released debut LP, Folding Walls, published by Manners McDade in May 2021 focusing on the themes of memory and trauma. 2024 sees further solo releases along with an EP with Berlin based producer Wittches.