Music manuscripts and papers of David Vaughan Thomas, 1841-1986, including personal papers of D. Vaughan Thomas, 1885-1932; correspondence, 1906-1945; musical compositions, 'Llyn y Fan', songs and hymns, [c. 1906]-[c. 1933]; published compositions, 1906-1933; lecture notes, [c. 1910]-1930; press cuttings, 1910-1938; and miscellaneous family papers, 1841-1986, including papers of Vaughan Thomas's grandfather and programme of a centenary concert, 1973.