Music manuscripts, 1878-1949, of J. T. Rees, comprising original full scores, draft scores and sets of orchestral parts for the bulk of his considerable output, including anthems, quintets, overtures, cantatas, choral works, songs and hymn-tunes, notably Duw sydd noddfa, Y trwbadwr, Y teulu dedwydd, String quartet, Hillsides of Wales and Christos.