Diaries relating to J. Lloyd Williams's personal life, his interest in Welsh music in general, and his own compositions. Entries reflecting his interest in the field of Welsh folk singing are prominent throughout the group.
Numerous collections of folk songs and hymn tunes accumulated by J. Lloyd Williams before and during his period as Editor of the Journal of the Welsh Folk-Song Society, including material which he himself had recorded and items submitted to him by others. Indexes, lists, related notes and press cuttings are also included.
Lecture notes relating to Welsh folk songs and folk tunes, including two series delivered at Bangor, 1934 and 1935, Coedpoeth, 1937, Llangefni, 1940, and a lecture entitled 'Neilltuolion Alawon Gwerin Cymru', undated but apparently delivered at Cardiff.
Incomplete outlines of four series of lectures delivered by J. Lloyd Williams to classes at Aberystwyth, 1929, Bala, 1928-1929, Blaenau Ffestiniog, 1927-1928, and Trawsfynydd, 1928-1929. The topics include the history of Welsh music, congregational singing and folk singing. Two short essays by a member of the Trawsfynydd class, 1927, relating to the gypsies of Llangwm, are also included.
Outlines of lectures and notes on traditional Welsh tunes and their characteristics, often relating to specific examples.