1. 2024
2. 'Os gwêl Bangor ei debyg eto, bydd gwyn ei byd': Golwg ar gyfraniad J. Lloyd Williams fel Cyfarwyddwr Cerdd a Chyfansoddwr rhwng 1897 a 1914

   Author: Keen, E., 15 Mar 2024

   Supervisor: Thomas, W. (Supervisor), Rees, S. (Supervisor) & Ap Sion, P. (Supervisor)

   Student thesis: Doctor of Philosophy

3. 2023

4. Nada Brahman: Pandit Pran Nath and La Monte Young, Terry Riley, Rhys Chatham and Michael Harrison

   Author: Boas, L., 31 Mar 2023

   Supervisor: ap Sion, P. (Supervisor) & Cunningham, J. (Supervisor)

   Student thesis: Masters by Research

5. The Tune is the Nation’s: Astudiaeth o Drefniannau Alawon Gwerin Cymreig Grace Williams

   Author: Jones, E., 16 Jan 2023

   Supervisor: Llewelyn Jones, I. (Supervisor) & ap Sion, P. (Supervisor)

   Student thesis: Masters by Research

6. 2022
7. The Adaptable Composer: Context and Collaboration: A portfolio of compositions

   Author: Roberts, C., 3 Feb 2022

   Supervisor: ap Sion, P. (Supervisor) & Puw, G. (Supervisor)

   Student thesis: Doctor of Philosophy

8. 2020
9. Waiting room

   Author: Hughes, T., 15 Jun 2020

   Supervisor: ap Sion, P. (Supervisor)

   Student thesis: Masters by Research

10. 2015

11. Multiples of the same : a semiotic study of Steve Reich's Counterpoint series

    Author: Bakker, T., Jan 2015

    Supervisor: Collins, C. (Supervisor) & ap Sion, P. (Supervisor)

    Student thesis: Doctor of Philosophy