Biography
Sion Trefor is a composer and multi-instrumentalist. He composed the scores for the FX series Say Nothing (2024), the Netflix series Toxic Town (2025) and Legends (2026).
His other credits include the BBC series Death Valley (2025), the Welsh-language feature Y Swn and the Netflix series How to Get to Heaven from Belfast (2026). Trefor runs a composition and production studio in Cardiff and has released solo instrumental albums.
