Papers, 1795-1980, mainly relating to John Roberts and his family, including papers, 1846-1888, concerning John Roberts, among them manuscript music, letters to Roberts and press cuttings; papers, 1875-1953, of, or relating to, J. L. Roberts ('Telynor Maldwyn', son of John Roberts); miscellaneous family papers, 1907-1911; stray letters, 1874-1980; music manuscripts, 1848 and undated; miscellanea, 1905-1981; and printed items, 1832-1848.

Two musical compositions: 'Stafell Cynddylan' (holograph) and 'Who is Sylvia?' by D. Vaughan Thomas.

Papers, 1941-1993, comprising musical compositions and arrangements by Hilda Morgan, both manuscript and published, together with publishing agreements and royalty statements, papers relating to the repertoire of Cavatina Choir, Penarth, and a list of Hilda Morgan's compositions.

Music compositions and related papers of Dr David Moule-Evans, 1925-1988; including orchestral symphonies, sonatas and other pieces, 1925-1965; and obituaries to him 1988.

The music manuscripts of the composer David Harries, 1952-1995, comprising mainly drafts and scores of chamber and instrumental music, orchestral music, choral and organ, and voice and piano arrangements.
A second donation made in August 2021 contains further music manuscripts of David Harries, 1953-1993, and includes works by Harries' contemporary William Mathias (1934-1992) in addition to Harries' own compositions of chamber and instrumental music, orchestral music, choral and organ, and voice and piano arrangements.

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.

Papers created and compiled by Peter Reynolds in his work as a composer of musical works, a writer and critic, and his lecture notes. Musical compositions include full orchestral scores, parts works, arrangements, draft works and sketches. Research papers and notes covering musical compositions, composers and artists, accumulated during his research for the writing of programme notes and his copywriting. Some of these files contain historical items collected for reference. Subject files and a large collection of concert and event literature. Teaching notes for lectures at WCMD and his composers workshops.
Two boxes of audio material have been transferred to The National Screen and Sound Archive of Wales.

Music manuscripts and personal papers of the composer William George, 1865-1920, including anthems, [1900]-1920; hymns, 1894-1920; part-songs, [1901]-1908; marching songs, 1901-1913; secular music, 1910-1917; duets, 1913-1919.

Musical manuscripts of the composer Grace Williams, [1928]-1992, including orchestral scores of her works, [1932]-1973, concertos for solo instruments and orchestra, 1950-1973; scripts and scores for narrator and orchestra, 1946-1963; incidental and chamber music scores, [1930s]-1970; choral music scores [1928]-1975; film and incidental music, 1948-1970; personal and miscellaneous papers, 1826-1936; and poetry by Vivien Cutting, 1947-[1967]; note on the papers, by A. J. Heward Rees, 1997.

Manuscript oratorios, operas, orchestral pieces, choruses, melodies and other musical compositions (including the four Welsh Airs arranged for choir and full orchestra premiered at the Crystal Palace, 1896); an autographed notebook containing solfa versions of Welsh melodies arranged for male voices, 1915; correspondence, 1934-1935, relating to the proposed publication of a memorial volume to Jenkins by nine of his contemporaries ('Er Cof am yr Athro David Jenkins Gan Naw o'i Gyfoedion'); music exercise books, 1877-1881, and a volume containing blacksmith's accounts, Trecastell, and particulars of payments to preachers, 1796-1810.

The music manuscripts and papers, 1933-2010, of Alun Hoddinott, comprising a large group of music scores and sketches, [1940?]-2007; and papers, 1933-2010, relating to his life and work, comprising mainly correspondence, 1933-2010, scrapbooks, 1940-2008, concert programmes, 1936-2008, catalogues of works, 1946-2007; and articles and reviews, 1954-2006. Two additional manuscripts: anthem 'In the Beginning' (Opus 23A), and Toccata alla Giga for organ (Opus 37), purchased July 2016 have been incorporated into the main series of music A3 and A5. An additional group received in 2017, of mainly personal papers and correspondence is listed under 'Alun Hoddinott, 2017 (additional)'. Additional papers comprising handwritten scores of Alun Hoddinott's Nocturne 1 for Piano (Opus 9) (1956) and Nocturne 2 for Piano (Opus 16, No. 1) (1959) (December 2021 donation) have been added to the description. A sketchbook of Symphony II Op29 was purchased September 2022.