A photograph of Cwmmawr Brass Band, which was a member of the West Wales Association of Brass Bands. The association was founded in September 1901, and some details appear in the Kidwelly Castle Contest programme of 13 July 1912. which include a brief history of the association, lists of the players in the member bands, and pictures of their bandmasters. As far as I know, none of these bands from 1912 have survived since that time, though successor bands in Gwaun-Cae-Gurwen and Burry Port keep the brass band tradition alive today.
For the Association’s details, see: http://www.ibew.co.uk/SH0104-wwales.pdf
For other scanned documents, including the full Kidwelly programme, see: http://www.ibew.co.uk/misc104.html
IBEW - the History of Brass Bands 