Music manuscripts and papers, [c. 1750]-1945, including hundreds of folk songs brought together by Dr J. Lloyd Williams in his role as Editor of the Welsh Folk-Song Society, and papers relating to his researches into the history of Welsh music; material relating to his interest and vocation in the field of botany, 1871-1942; and personal papers, [?1870]-1946.

An extra-leaved copy of M. O. Jones, Bywgraffiaeth Cerddorion Cymreig (Cymdeithas yr Eisteddfod Genedlaethol, 1890), from the library of John Jones ('Myrddin Fardd'), with press cuttings of additional relevant material, e.g. 'Hen Gerddorion' by Ellis Williams ('Ylltyr Eryri'), Dolgellau, 'Telynau a Thelynorion Cymru Fu' by David Parry, Utica, 'Rhestr Eos Llechyd o "Lyfrau Cerddoriaeth gan Gymry"', 1884, 'Hen Gerddorion Tref Caernarfon', 1895, obituary notices of John Richards ('Isalaw'), 1901, 'William Williams, "Will Pen-y-morfa", Telynor' by Robert Griffith, Manchester, etc., and some annotations in the hand of Myrddin Fardd.

The series comprises scrapbooks, press cuttings, programmes and other material, [c. 1950]-1998, relating to Welsh actors, musicians and authors, accumulated by Dr Terence Rees.

A collection of hymn-tunes and other pieces composed in the second half of the nineteenth century by William Evans Alaw Afan.