Sion Trefor is an American musician, multi-instrumentalist and composer for film and television who has written music for Say Nothing (2024), Death Valley (2025), Toxic Town (2025), Creisis (2024), London Recruits (2024), Gavin & Stacey (2019), Charlotte Church’s Dream Build (2022), Minds Wide Open: Unlocking the Potential of the Human Brain (2018), Dal Y Mellt (2022).
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