Annual reports of the National Council of Music, 1922-1959; papers relating to meetings of the Council, 1918-1960; papers and correspondence of the University Registrar and Council officers, 1919-1960; Council publications, [c.1923-1943]; papers of Council sub-committees, 1919-1960; and papers relating to the Three Valleys Festival, the Cardiff Musical Society and the Cardiff Chamber Music Concerts, 1904-1946.

Reports relating to music education in Caernarfonshire, minutes of the Sub-Committee of the county council; feedback from headmasters to a memorandum on music for schools; documents relating to music in schools throughout Wales in general; and related correspondence. J. Lloyd Williams is the author of a number of these reports and the file also includes a critical report by him on the role of Welsh music in the music departments of the University of Wales.